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(1/3)*(3*y+12)-6 = (-1/3)*(6*y-21) // - (-1/3)*(6*y-21)
(1/3)*(3*y+12)-((-1/3)*(6*y-21))-6 = 0
(1/3)*(3*y+12)+(1/3)*(6*y-21)-6 = 0
1/3*(3*y+12)+1/3*(6*y-21)-6 = 0
1/3*(3*y+12)+1/3*(6*y-21)-6 = 0
3*y-6-3 = 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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