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x in (-oo:+oo)
(7/2)*x+(1/2)*x = 4*x+(9/2)*x+27/2 // - 4*x+(9/2)*x+27/2
(7/2)*x+(1/2)*x-(4*x)-((9/2)*x)-(27/2) = 0
(7/2)*x+(1/2)*x-4*x+(-9/2)*x-27/2 = 0
-9/2*x-27/2 = 0 // + 27/2
-9/2*x = 27/2 // : -9/2
x = 27/2/(-9/2)
x = -3
x = -3
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