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(20/60)*x+12/60 = (30/60)*x-(15/60) // - (30/60)*x-(15/60)
(20/60)*x-((30/60)*x)+12/60+15/60 = 0
(20/60)*x+(-1/2)*x+12/60+15/60 = 0
9/20-1/6*x = 0 // - 9/20
-1/6*x = -9/20 // : -1/6
x = -9/20/(-1/6)
x = 27/10
x = 27/10
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