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(1/7)*(7*y+14)-7 = (-1/8)*(16*y-32) // - (-1/8)*(16*y-32)
(1/7)*(7*y+14)-((-1/8)*(16*y-32))-7 = 0
(1/7)*(7*y+14)+(1/8)*(16*y-32)-7 = 0
1/7*(7*y+14)+1/8*(16*y-32)-7 = 0
1/7*(7*y+14)+1/8*(16*y-32)-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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