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(1/3)*(3*x+12)-6 = (-1/7)*(14*x-49) // - (-1/7)*(14*x-49)
(1/3)*(3*x+12)-((-1/7)*(14*x-49))-6 = 0
(1/3)*(3*x+12)+(1/7)*(14*x-49)-6 = 0
1/3*(3*x+12)+1/7*(14*x-49)-6 = 0
1/3*(3*x+12)+1/7*(14*x-49)-6 = 0
3*x-6-3 = 0
3*x-9 = 0
3*x-9 = 0
3*x-9 = 0 // + 9
3*x = 9 // : 3
x = 9/3
x = 3
x = 3
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