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x in (-oo:+oo)
84 = (6*x)/8 // - (6*x)/8
84-((6*x)/8) = 0
(-3/4)*x+84 = 0
84-3/4*x = 0 // - 84
-3/4*x = -84 // : -3/4
x = -84/(-3/4)
x = 112
x = 112
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