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(2/5)*(2*x-15) = (-1/5)*(10-(2*x)) // - (-1/5)*(10-(2*x))
(2/5)*(2*x-15)-((-1/5)*(10-(2*x))) = 0
(2/5)*(2*x-15)+(1/5)*(10-2*x) = 0
2/5*(2*x-15)+1/5*(10-2*x) = 0
2/5*(2*x-15)+1/5*(10-2*x) = 0
2/5*x-4 = 0
2/5*x-4 = 0
2/5*x-4 = 0 // + 4
2/5*x = 4 // : 2/5
x = 4/2/5
x = 10
x = 10
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