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x in (-oo:+oo)
(-1/4)*x+(3/4)*x = -15 // + 15
(-1/4)*x+(3/4)*x+15 = 0
1/2*x+15 = 0 // - 15
1/2*x = -15 // : 1/2
x = -15/1/2
x = -30
x = -30
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