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x in (-oo:+oo)
(-5/7)*x = -5/14 // + -5/14
(-5/7)*x-(-5/14) = 0
(-5/7)*x+5/14 = 0
5/14-5/7*x = 0 // - 5/14
-5/7*x = -5/14 // : -5/7
x = -5/14/(-5/7)
x = 1/2
x = 1/2
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