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