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y in (-oo:+oo)
2*((5/2)*y-(2*y)) = 12 // - 12
2*((5/2)*y-(2*y))-12 = 0
2*((5/2)*y-2*y)-12 = 0
1/2*2*y-12 = 0
1/2*2*y-12 = 0
y-12 = 0
y-12 = 0
y-12 = 0 // + 12
y = 12
y = 12
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