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x in (-oo:+oo)
x-8 = (3/7)*x // - (3/7)*x
x-((3/7)*x)-8 = 0
x+(-3/7)*x-8 = 0
4/7*x-8 = 0 // + 8
4/7*x = 8 // : 4/7
x = 8/4/7
x = 14
x = 14
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