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(1/3)*(y+15) = 2*y-(5*(y-7)) // - 2*y-(5*(y-7))
(1/3)*(y+15)+5*(y-7)-(2*y) = 0
(1/3)*(y+15)+5*(y-7)-2*y = 0
1/3*(y+15)+5*(y-7)-2*y = 0
1/3*(y+15)+5*(y-7)-2*y = 0
16/3*y-2*y-30 = 0
10/3*y-30 = 0
10/3*y-30 = 0
10/3*y-30 = 0 // + 30
10/3*y = 30 // : 10/3
y = 30/10/3
y = 9
y = 9
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