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x in (-oo:+oo)
x-((3/8)*x) = 45 // - 45
x-((3/8)*x)-45 = 0
x+(-3/8)*x-45 = 0
5/8*x-45 = 0 // + 45
5/8*x = 45 // : 5/8
x = 45/5/8
x = 72
x = 72
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