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y in (-oo:+oo)
y+y+35/9+14/5 = 7 // - 7
y+y+35/9+14/5-7 = 0
2*y-14/45 = 0 // + 14/45
2*y = 14/45 // : 2
y = 14/45/2
y = 7/45
y = 7/45
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