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(2/5)*(10*x+15) = 18-(4*(x-3)) // - 18-(4*(x-3))
(2/5)*(10*x+15)+4*(x-3)-18 = 0
2/5*(10*x+15)+4*(x-3)-18 = 0
2/5*(10*x+15)+4*(x-3)-18 = 0
8*x-18-6 = 0
8*x-24 = 0
8*x-24 = 0
8*x-24 = 0 // + 24
8*x = 24 // : 8
x = 24/8
x = 3
x = 3
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