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5*(x-(3/10)) = 2*x+9/2 // - 2*x+9/2
5*(x-(3/10))-(2*x)-(9/2) = 0
5*(x-3/10)-2*x-9/2 = 0
(2*5*(x-3/10))/2+(-2*2*x)/2-9/2 = 0
2*5*(x-3/10)-2*2*x-9 = 0
6*x-9-3 = 0
6*x-12 = 0
(6*x-12)/2 = 0
(6*x-12)/2 = 0 // * 2
6*x-12 = 0
6*x-12 = 0 // + 12
6*x = 12 // : 6
x = 12/6
x = 2
x = 2
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