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(9/12)*x-((4/12)*x) = (10/12)*x-5 // - (10/12)*x-5
(9/12)*x-((4/12)*x)-((10/12)*x)+5 = 0
(9/12)*x+(-1/3)*x+(-5/6)*x+5 = 0
5-5/12*x = 0 // - 5
-5/12*x = -5 // : -5/12
x = -5/(-5/12)
x = 12
x = 12
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