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(9/10)*(x+3)-((9/20)*x) = 0
(9/10)*(x+3)+(-9/20)*x = 0
9/10*(x+3)+(-9*x)/20 = 0
(9/10*20*(x+3))/20+(-9*x)/20 = 0
9/10*20*(x+3)-9*x = 0
9*x+54 = 0
(9*x+54)/20 = 0
(9*x+54)/20 = 0 // * 20
9*x+54 = 0
9*x+54 = 0 // - 54
9*x = -54 // : 9
x = -54/9
x = -6
x = -6
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