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