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x in (-oo:+oo)
(1/4)*x-x = -15 // + 15
(1/4)*x-x+15 = 0
15-3/4*x = 0 // - 15
-3/4*x = -15 // : -3/4
x = -15/(-3/4)
x = 20
x = 20
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