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x in (-oo:+oo)
4/7-((3/7)*x) = 1 // - 1
4/7-((3/7)*x)-1 = 0
(-3/7)*x+4/7-1 = 0
-3/7*x-3/7 = 0 // + 3/7
-3/7*x = 3/7 // : -3/7
x = 3/7/(-3/7)
x = -1
x = -1
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