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y in (-oo:+oo)
7/12-y = -2/3 // + -2/3
7/12-y-(-2/3) = 0
7/12-y+2/3 = 0
5/4-y = 0 // - 5/4
-y = -5/4 // * -1
y = 5/4
y = 5/4
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