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x in (-oo:+oo)
x/2+(3*x)/4 = 20 // - 20
x/2+(3*x)/4-20 = 0
5/4*x-20 = 0 // + 20
5/4*x = 20 // : 5/4
x = 20/5/4
x = 16
x = 16
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