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(2/5)*(3*x+7) = 3*(3-(4*x))+7 // - 3*(3-(4*x))+7
(2/5)*(3*x+7)-(3*(3-(4*x)))-7 = 0
(2/5)*(3*x+7)-3*(3-4*x)-7 = 0
2/5*(3*x+7)-3*(3-4*x)-7 = 0
2/5*(3*x+7)-3*(3-4*x)-7 = 0
66/5*x-7-31/5 = 0
66/5*x-66/5 = 0
66/5*x-66/5 = 0
66/5*x-66/5 = 0 // + 66/5
66/5*x = 66/5 // : 66/5
x = 66/5/66/5
x = 1
x = 1
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