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y in (-oo:+oo)
y+y-(16/2)-(9/7) = -8 // + 8
y+y-(16/2)-(9/7)+8 = 0
y+y-9/7-8+8 = 0
2*y-9/7 = 0 // + 9/7
2*y = 9/7 // : 2
y = 9/7/2
y = 9/14
y = 9/14
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