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x in (-oo:+oo)
(7/2)*x+(1/2)*x = 2*x+(5/2)*x+3/2 // - 2*x+(5/2)*x+3/2
(7/2)*x+(1/2)*x-(2*x)-((5/2)*x)-(3/2) = 0
(7/2)*x+(1/2)*x-2*x+(-5/2)*x-3/2 = 0
-1/2*x-3/2 = 0 // + 3/2
-1/2*x = 3/2 // : -1/2
x = 3/2/(-1/2)
x = -3
x = -3
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