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(2/3)*(9*y+3) = 4*y+7 // - 4*y+7
(2/3)*(9*y+3)-(4*y)-7 = 0
(2/3)*(9*y+3)-4*y-7 = 0
2/3*(9*y+3)-4*y-7 = 0
2/3*(9*y+3)-4*y-7 = 0
2*y-7+2 = 0
2*y-5 = 0
2*y-5 = 0
2*y-5 = 0 // + 5
2*y = 5 // : 2
y = 5/2
y = 5/2
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