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x in (-oo:+oo)
(-1/2)*x+3 = 15/2 // - 15/2
(-1/2)*x-(15/2)+3 = 0
(-1/2)*x-15/2+3 = 0
-1/2*x-9/2 = 0 // + 9/2
-1/2*x = 9/2 // : -1/2
x = 9/2/(-1/2)
x = -9
x = -9
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