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y in (-oo:+oo)
7*y-(12/3)+5 = y+13 // - y+13
7*y-y-(12/3)-13+5 = 0
7*y-y-13-4+5 = 0
6*y-12 = 0 // + 12
6*y = 12 // : 6
y = 12/6
y = 2
y = 2
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