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x in (-oo:+oo)
x/5 = 87.5 // - 87.5
x/5-87.5 = 0
1/5*x-87.5 = 0 // + 87.5
1/5*x = 87.5 // : 1/5
x = 87.5/1/5
x = 437.5
x = 437.5
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