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(1/3)*(y+12) = 3*y-(5*(y-5)) // - 3*y-(5*(y-5))
(1/3)*(y+12)+5*(y-5)-(3*y) = 0
(1/3)*(y+12)+5*(y-5)-3*y = 0
1/3*(y+12)+5*(y-5)-3*y = 0
1/3*(y+12)+5*(y-5)-3*y = 0
16/3*y-3*y-21 = 0
7/3*y-21 = 0
7/3*y-21 = 0
7/3*y-21 = 0 // + 21
7/3*y = 21 // : 7/3
y = 21/7/3
y = 9
y = 9
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