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y in (-oo:+oo)
4*y-(8/3) = -2*y // + -2*y
4*y-(-2*y)-(8/3) = 0
4*y+2*y-8/3 = 0
6*y-8/3 = 0 // + 8/3
6*y = 8/3 // : 6
y = 8/3/6
y = 4/9
y = 4/9
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