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x in (-oo:+oo)
15 = -x/4 // + -x/4
15-(-x/4) = 0
(1/4)*x+15 = 0
1/4*x+15 = 0 // - 15
1/4*x = -15 // : 1/4
x = -15/1/4
x = -60
x = -60
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