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y in (-oo:+oo)
2*y+2/3 = -4/7 // + -4/7
2*y+2/3-(-4/7) = 0
2*y+2/3+4/7 = 0
2*y+26/21 = 0 // - 26/21
2*y = -26/21 // : 2
y = -26/21/2
y = -13/21
y = -13/21
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