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x in (-oo:+oo)
x-((1/3)*x) = 72 // - 72
x-((1/3)*x)-72 = 0
x+(-1/3)*x-72 = 0
2/3*x-72 = 0 // + 72
2/3*x = 72 // : 2/3
x = 72/2/3
x = 108
x = 108
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