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(1/3)*(3*y+6)-7 = (-1/3)*(6*y-12) // - (-1/3)*(6*y-12)
(1/3)*(3*y+6)-((-1/3)*(6*y-12))-7 = 0
(1/3)*(3*y+6)+(1/3)*(6*y-12)-7 = 0
1/3*(3*y+6)+1/3*(6*y-12)-7 = 0
1/3*(3*y+6)+1/3*(6*y-12)-7 = 0
3*y-7-2 = 0
3*y-9 = 0
3*y-9 = 0
3*y-9 = 0 // + 9
3*y = 9 // : 3
y = 9/3
y = 3
y = 3
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