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x in (-oo:+oo)
x+((1/2)*x)/2 = 50 // - 50
x+((1/2)*x)/2-50 = 0
5/4*x-50 = 0 // + 50
5/4*x = 50 // : 5/4
x = 50/5/4
x = 40
x = 40
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