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y in (-oo:+oo)
y/7 = 2/3-(1/5) // - 2/3-(1/5)
y/7-(2/3)+1/5 = 0
y/7-2/3+1/5 = 0
1/7*y-7/15 = 0 // + 7/15
1/7*y = 7/15 // : 1/7
y = 7/15/1/7
y = 49/15
y = 49/15
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