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x in (-oo:+oo)
-4*x = 3/4 // - 3/4
-4*x-(3/4) = 0
-4*x-3/4 = 0
-4*x-3/4 = 0 // + 3/4
-4*x = 3/4 // : -4
x = 3/4/(-4)
x = -3/16
x = -3/16
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