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(3/5)*(2*x+13) = 4*(3-(3*x))+9 // - 4*(3-(3*x))+9
(3/5)*(2*x+13)-(4*(3-(3*x)))-9 = 0
(3/5)*(2*x+13)-4*(3-3*x)-9 = 0
3/5*(2*x+13)-4*(3-3*x)-9 = 0
3/5*(2*x+13)-4*(3-3*x)-9 = 0
66/5*x-9-21/5 = 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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