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x in (-oo:+oo)
(-3/4)*x-((1/2)*x) = 6-2 // - 6-2
(-3/4)*x-((1/2)*x)-6+2 = 0
(-3/4)*x+(-1/2)*x-6+2 = 0
-5/4*x-4 = 0 // + 4
-5/4*x = 4 // : -5/4
x = 4/(-5/4)
x = -16/5
x = -16/5
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