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(1/3)*(6*y+30) = 4*(y+19) // - 4*(y+19)
(1/3)*(6*y+30)-(4*(y+19)) = 0
(1/3)*(6*y+30)-4*(y+19) = 0
1/3*(6*y+30)-4*(y+19) = 0
1/3*(6*y+30)-4*(y+19) = 0
-2*y-66 = 0
-2*y-66 = 0
-2*y-66 = 0 // + 66
-2*y = 66 // : -2
y = 66/(-2)
y = -33
y = -33
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