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(2/7)*(5*x+4) = (1/2)*(3*x-8)+3 // - (1/2)*(3*x-8)+3
(2/7)*(5*x+4)-((1/2)*(3*x-8))-3 = 0
(2/7)*(5*x+4)+(-1/2)*(3*x-8)-3 = 0
2/7*(5*x+4)-1/2*(3*x-8)-3 = 0
2/7*(5*x+4)-1/2*(3*x-8)-3 = 0
36/7-1/14*x-3 = 0
15/7-1/14*x = 0
15/7-1/14*x = 0
15/7-1/14*x = 0 // - 15/7
-1/14*x = -15/7 // : -1/14
x = -15/7/(-1/14)
x = 30
x = 30
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