The solution equation (1) x + 4x-3 of 7 has 1 of 7 = 0 (2) 12.4 * 3-2x of 4 = 8

（1）x=2
(2) X = - 5 / 2

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1. Solving equation (6-2x) ^ 2 + x ^ 2 = 8
2. Solving equation 6 (2x-7) = 5 (x + 8) - 12 Another problem is to solve the equation 3x-2 = half x + two thirds
3. Solve the equation, X (8-2x) = 6
4. Solve the equation 19-120% x = 7 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 78x = 2140 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; x-28% x = 3.6
5. 19-120% x = 7 (solving equation)
6. 25 + 60% X40 120% x + 7 = 19 to solve the equation fast
7. Please use the sixth grade method to solve equation problems, x-3 / 16x = 27.2
8. Please use the sixth grade method to solve equation problems 5 / 8x-80% = 16.2
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16. The following equations are solved by the method of addition, subtraction and elimination: (1) x + 1 / 3 = y + 2 / 4, x-3 / 4-y-3 / 3 = 1 / 12, (2) 0.2x + 0.5y = 0.20.4x + 0.1Y = 0.4 The steps of solving the equation must be clear once!
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19. The value of solution X and y of quadratic equation 2x-5y = 7, x-4y = k is also equation x + y = 7, then the value of K is the same
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