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x in (-oo:+oo)
(-1/2)*x+3 = 2*x-6 // - 2*x-6
(-1/2)*x-(2*x)+3+6 = 0
(-1/2)*x-2*x+3+6 = 0
9-5/2*x = 0 // - 9
-5/2*x = -9 // : -5/2
x = -9/(-5/2)
x = 18/5
x = 18/5
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