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x in (-oo:+oo)
(-3/4)*x-6 = 3 // - 3
(-3/4)*x-6-3 = 0
-3/4*x-9 = 0 // + 9
-3/4*x = 9 // : -3/4
x = 9/(-3/4)
x = -12
x = -12
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