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x in (-oo:+oo)
x-((1/4)*x) = 30 // - 30
x-((1/4)*x)-30 = 0
x+(-1/4)*x-30 = 0
3/4*x-30 = 0 // + 30
3/4*x = 30 // : 3/4
x = 30/3/4
x = 40
x = 40
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