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y in (-oo:+oo)
3*y+3/7 = 4*y+2/7 // - 4*y+2/7
3*y-(4*y)+3/7-(2/7) = 0
3*y-4*y+3/7-2/7 = 0
1/7-y = 0 // - 1/7
-y = -1/7 // * -1
y = 1/7
y = 1/7
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