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x in (-oo:+oo)
-6/7 = x/84 // - x/84
-(x/84)-6/7 = 0
-1/84*x-6/7 = 0 // + 6/7
-1/84*x = 6/7 // : -1/84
x = 6/7/(-1/84)
x = -72
x = -72
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