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y in (-oo:+oo)
3*y-(4/5) = 7 // - 7
3*y-(4/5)-7 = 0
3*y-4/5-7 = 0
3*y-39/5 = 0 // + 39/5
3*y = 39/5 // : 3
y = 39/5/3
y = 13/5
y = 13/5
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