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x in (-oo:+oo)
56 = (8/7)*x // - (8/7)*x
56-((8/7)*x) = 0
(-8/7)*x+56 = 0
56-8/7*x = 0 // - 56
-8/7*x = -56 // : -8/7
x = -56/(-8/7)
x = 49
x = 49
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