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x in (-oo:+oo)
(1/4)*x-1 = -15/4 // + -15/4
(1/4)*x-(-15/4)-1 = 0
(1/4)*x+15/4-1 = 0
1/4*x+11/4 = 0 // - 11/4
1/4*x = -11/4 // : 1/4
x = -11/4/1/4
x = -11
x = -11
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