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x in (-oo:+oo)
x-((3/4)*x) = 10 // - 10
x-((3/4)*x)-10 = 0
x+(-3/4)*x-10 = 0
1/4*x-10 = 0 // + 10
1/4*x = 10 // : 1/4
x = 10/1/4
x = 40
x = 40
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