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x in (-oo:+oo)
8 = (3/28)*x // - (3/28)*x
8-((3/28)*x) = 0
(-3/28)*x+8 = 0
8-3/28*x = 0 // - 8
-3/28*x = -8 // : -3/28
x = -8/(-3/28)
x = 224/3
x = 224/3
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