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x in (-oo:+oo)
(1/8)*(x+250) = 125 // - 125
(1/8)*(x+250)-125 = 0
1/8*(x+250)-125 = 0
1/8*(x+250)-125 = 0
1/8*x-375/4 = 0
1/8*x-375/4 = 0
1/8*x-375/4 = 0 // + 375/4
1/8*x = 375/4 // : 1/8
x = 375/4/1/8
x = 750
x = 750
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