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(3/5)*x-15 = (6/5)*x+12 // - (6/5)*x+12
(3/5)*x-((6/5)*x)-15-12 = 0
(3/5)*x+(-6/5)*x-15-12 = 0
-3/5*x-27 = 0 // + 27
-3/5*x = 27 // : -3/5
x = 27/(-3/5)
x = -45
x = -45
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