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y in (-oo:+oo)
y/3 = 4/7 // - 4/7
y/3-(4/7) = 0
y/3-4/7 = 0
1/3*y-4/7 = 0 // + 4/7
1/3*y = 4/7 // : 1/3
y = 4/7/1/3
y = 12/7
y = 12/7
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