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x in (-oo:+oo)
(-3/4)*x+(1/2)*x+2 = 5 // - 5
(-3/4)*x+(1/2)*x-5+2 = 0
-1/4*x-3 = 0 // + 3
-1/4*x = 3 // : -1/4
x = 3/(-1/4)
x = -12
x = -12
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