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