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y in (-oo:+oo)
(1/2)*y-(13/2) = (5/2)*y+7/2 // - (5/2)*y+7/2
(1/2)*y-((5/2)*y)-(13/2)-(7/2) = 0
(1/2)*y+(-5/2)*y-13/2-7/2 = 0
-2*y-10 = 0 // + 10
-2*y = 10 // : -2
y = 10/(-2)
y = -5
y = -5
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