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12 = 12/(-5)-6*x // - 12/(-5)-6*x
12-(-6*x)-(12/(-5)) = 0
6*x+12/5+12 = 0
6*x+72/5 = 0 // - 72/5
6*x = -72/5 // : 6
x = -72/5/6
x = -12/5
x = -12/5
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