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x in (-oo:+oo)
8 = (4/7)*x // - (4/7)*x
8-((4/7)*x) = 0
(-4/7)*x+8 = 0
8-4/7*x = 0 // - 8
-4/7*x = -8 // : -4/7
x = -8/(-4/7)
x = 14
x = 14
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