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