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x in (-oo:+oo)
x-((1/4)*x) = 20 // - 20
x-((1/4)*x)-20 = 0
x+(-1/4)*x-20 = 0
3/4*x-20 = 0 // + 20
3/4*x = 20 // : 3/4
x = 20/3/4
x = 80/3
x = 80/3
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