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x in (-oo:+oo)
(-3/7)*x+1 = 13/14 // - 13/14
(-3/7)*x-(13/14)+1 = 0
(-3/7)*x-13/14+1 = 0
1/14-3/7*x = 0 // - 1/14
-3/7*x = -1/14 // : -3/7
x = -1/14/(-3/7)
x = 1/6
x = 1/6
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