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x in (-oo:+oo)
(-3/4)*x = 20 // - 20
(-3/4)*x-20 = 0
-3/4*x-20 = 0 // + 20
-3/4*x = 20 // : -3/4
x = 20/(-3/4)
x = -80/3
x = -80/3
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