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x in (-oo:+oo)
(-3/4)*x+1/2 = 13/2 // - 13/2
(-3/4)*x+1/2-(13/2) = 0
(-3/4)*x+1/2-13/2 = 0
-3/4*x-6 = 0 // + 6
-3/4*x = 6 // : -3/4
x = 6/(-3/4)
x = -8
x = -8
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