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(1/5)*(x+3)-(4*(2*x-3)) = 9/10 // - 9/10
(1/5)*(x+3)-(4*(2*x-3))-(9/10) = 0
(1/5)*(x+3)-4*(2*x-3)-9/10 = 0
1/5*(x+3)-4*(2*x-3)-9/10 = 0
(1/5*10*(x+3))/10+(-4*10*(2*x-3))/10-9/10 = 0
1/5*10*(x+3)-4*10*(2*x-3)-9 = 0
126-78*x-9 = 0
117-78*x = 0
(117-78*x)/10 = 0
(117-78*x)/10 = 0 // * 10
117-78*x = 0
117-78*x = 0 // - 117
-78*x = -117 // : -78
x = -117/(-78)
x = 3/2
x = 3/2
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