8x + 2x = 31.4, solved by equation,

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• 2. How to solve 18 + x = (48 + x) * 4 / 9
• 3. 60(x+1)=90(x-1)
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• 5. 6*5+90*5=x
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• 8. 18: X / 12 = 3:5, how to set up this equation?
• 9. How to solve this equation 15 △ x = 10
• 10. (15-x): 10 = 17:18
• 11. It is known that the solution of the equation 3x + a = 0 about X is 5 times larger than that of the equation 3x-a = 0=
• 12. The solution of equation 2 (4-x) + 7 = 3x and the solution of equation 3 (x-k) = 4K - (x / 2) about X are reciprocal to each other, and the value of K is obtained
• 13. 56-x=5(x+4)
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• 15. Equation x-10x + 20 = 0
• 16. The equations 10x = 0 and X △ 10 = 0 have no solution? Is it right or wrong? The equations 10x = 0 and X △ 10 = 0 have no solutions? Right or wrong?
• 17. 10x + 6-x + 18 = 10 * (6-x) + X to solve the equation
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• 19. Solving equation x / 15-2 = x / 30 + 10 / 60
• 20. The common solution of the equations 2x-y = 7 and X + 2Y = - 4 is ()