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x in (-oo:+oo)
(7/2)*x+(1/2)*x = 4*x+(7/2)*x+14/2 // - 4*x+(7/2)*x+14/2
(7/2)*x+(1/2)*x-(4*x)-((7/2)*x)-(14/2) = 0
(7/2)*x+(1/2)*x-4*x+(-7/2)*x-7 = 0
-7/2*x-7 = 0 // + 7
-7/2*x = 7 // : -7/2
x = 7/(-7/2)
x = -2
x = -2
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