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x in (-oo:+oo)
(-3/4)*x = 15/20 // - 15/20
(-3/4)*x-(15/20) = 0
(-3/4)*x-3/4 = 0
-3/4*x-3/4 = 0 // + 3/4
-3/4*x = 3/4 // : -3/4
x = 3/4/(-3/4)
x = -1
x = -1
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