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y in (-oo:+oo)
2-((5*y)/2) = 12 // - 12
2-((5*y)/2)-12 = 0
(-5/2)*y-12+2 = 0
-5/2*y-10 = 0 // + 10
-5/2*y = 10 // : -5/2
y = 10/(-5/2)
y = -4
y = -4
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