3 × 2 + 2x = 12 solution equation

3 × 2 + 2x = 12 solution equation

6+2x＝12
2x＝12-6
2x＝6
x＝6÷2
x＝3

Solution equation: 0.12-4.2x = 0.04-2.2x-0.2

0.12 - 0.04 + 0.2 = 4.2x - 2.2x
0.28 = 2x
x = 0.14

Solving equation 12-2 (2X-4) = X-7

12-2(2x-4)=x-7
12-4x+8=x-7
4x+x=12+8+7
5x=27
x=27÷5
x=5.4

3(2x-5)-4(3y+4)=5,x+1=5(y+2) x+y=420,30%+40%y=160
3(2x-5)-4(3y+4)=5,x+1=5(y+2)
x+y=420,30%+40%y=160×80%

1. X + 1 = 5 (y + 2), 3 (2x-5) - 4 (3Y + 4) = 5. After finishing the first formula, there is x-5y = 9, after finishing the second formula, there is x-2y = 6, after subtracting the two formulas, there is 3Y = - 3, so y = - 1, x = 42