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x in (-oo:+oo)
x-((1/4)*x) = 9 // - 9
x-((1/4)*x)-9 = 0
x+(-1/4)*x-9 = 0
3/4*x-9 = 0 // + 9
3/4*x = 9 // : 3/4
x = 9/3/4
x = 12
x = 12
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