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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
3*y-12 = 0 // + 12
3*y = 12 // : 3
y = 12/3
y = 4
y = 4
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