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(2/5)*(2*x+9) = 3*(4-(2*x))+12 // - 3*(4-(2*x))+12
(2/5)*(2*x+9)-(3*(4-(2*x)))-12 = 0
(2/5)*(2*x+9)-3*(4-2*x)-12 = 0
2/5*(2*x+9)-3*(4-2*x)-12 = 0
2/5*(2*x+9)-3*(4-2*x)-12 = 0
34/5*x-12-42/5 = 0
34/5*x-102/5 = 0
34/5*x-102/5 = 0
34/5*x-102/5 = 0 // + 102/5
34/5*x = 102/5 // : 34/5
x = 102/5/34/5
x = 3
x = 3
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