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x in (-oo:+oo)
(1*x)/4 = -3 // + 3
(1*x)/4+3 = 0
x/4+3 = 0
1/4*x+3 = 0 // - 3
1/4*x = -3 // : 1/4
x = -3/1/4
x = -12
x = -12
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