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(2/3)*(6*y+3) = 6*y+4 // - 6*y+4
(2/3)*(6*y+3)-(6*y)-4 = 0
(2/3)*(6*y+3)-6*y-4 = 0
2/3*(6*y+3)-6*y-4 = 0
2/3*(6*y+3)-6*y-4 = 0
2-2*y-4 = 0
-2*y-2 = 0
-2*y-2 = 0
-2*y-2 = 0 // + 2
-2*y = 2 // : -2
y = 2/(-2)
y = -1
y = -1
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