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(1/3)*(6*y-3) = 13-2*y // - 13-2*y
(1/3)*(6*y-3)-(-2*y)-13 = 0
(1/3)*(6*y-3)+2*y-13 = 0
1/3*(6*y-3)+2*y-13 = 0
1/3*(6*y-3)+2*y-13 = 0
4*y-13-1 = 0
4*y-14 = 0
4*y-14 = 0
4*y-14 = 0 // + 14
4*y = 14 // : 4
y = 14/4
y = 7/2
y = 7/2
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