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