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(1/4)*x-9 = (3/8)*x // - (3/8)*x
(1/4)*x-((3/8)*x)-9 = 0
(1/4)*x+(-3/8)*x-9 = 0
-1/8*x-9 = 0 // + 9
-1/8*x = 9 // : -1/8
x = 9/(-1/8)
x = -72
x = -72
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