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x in (-oo:+oo)
x+x/4+x/2 = 100 // - 100
x+x/4+x/2-100 = 0
7/4*x-100 = 0 // + 100
7/4*x = 100 // : 7/4
x = 100/7/4
x = 400/7
x = 400/7
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