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x in (-oo:+oo)
(5/2)*x+(1/2)*x = (7/2)*x+71/2 // - (7/2)*x+71/2
(5/2)*x+(1/2)*x-((7/2)*x)-(71/2) = 0
(5/2)*x+(1/2)*x+(-7/2)*x-71/2 = 0
-1/2*x-71/2 = 0 // + 71/2
-1/2*x = 71/2 // : -1/2
x = 71/2/(-1/2)
x = -71
x = -71
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