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x in (-oo:+oo)
(3/8)*x = 125 // - 125
(3/8)*x-125 = 0
3/8*x-125 = 0 // + 125
3/8*x = 125 // : 3/8
x = 125/3/8
x = 1000/3
x = 1000/3
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