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x in (-oo:+oo)
x/4 = 12.5 // - 12.5
x/4-12.5 = 0
1/4*x-12.5 = 0 // + 12.5
1/4*x = 12.5 // : 1/4
x = 12.5/1/4
x = 50
x = 50
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