Question

resolver a equações 7(×-1)=2(3×+1) e 3(×+2)+5=×+12

Answer 1

a)

7(x - 1) = 2(3x + 1)
7x - 7 = 6x + 2
7x - 6x = 2 + 7
x = 9
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b)

3.(x + 2) + 5 = x + 12
3x + 6 + 5 = x + 12
3x + 11 = x + 12
3x - x = 12 - 11
2x = 1
x = 1/2