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x in (-oo:+oo)
1-((1/7)*x) = 13/14 // - 13/14
1-((1/7)*x)-(13/14) = 0
(-1/7)*x-13/14+1 = 0
1/14-1/7*x = 0 // - 1/14
-1/7*x = -1/14 // : -1/7
x = -1/14/(-1/7)
x = 1/2
x = 1/2
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