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y in (-oo:+oo)
y/2+5/7 = y/7-(5/7) // - y/7-(5/7)
y/2-(y/7)+5/7+5/7 = 0
5/14*y+10/7 = 0 // - 10/7
5/14*y = -10/7 // : 5/14
y = -10/7/5/14
y = -4
y = -4
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