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7*8-x+12 = x/2-15 // - x/2-15
7*8-x-(x/2)+12+15 = 0
83-3/2*x = 0 // - 83
-3/2*x = -83 // : -3/2
x = -83/(-3/2)
x = 166/3
x = 166/3
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