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y in (-oo:+oo)
2*y-(16/5) = -4*y // + -4*y
2*y-(-4*y)-(16/5) = 0
2*y+4*y-16/5 = 0
6*y-16/5 = 0 // + 16/5
6*y = 16/5 // : 6
y = 16/5/6
y = 8/15
y = 8/15
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