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x in (-oo:+oo)
(5/2)*x+(1/2)*x = (7/2)*x+161/2 // - (7/2)*x+161/2
(5/2)*x+(1/2)*x-((7/2)*x)-(161/2) = 0
(5/2)*x+(1/2)*x+(-7/2)*x-161/2 = 0
-1/2*x-161/2 = 0 // + 161/2
-1/2*x = 161/2 // : -1/2
x = 161/2/(-1/2)
x = -161
x = -161
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