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x in (-oo:+oo)
x/5 = -5/7 // + -5/7
x/5-(-5/7) = 0
x/5+5/7 = 0
1/5*x+5/7 = 0 // - 5/7
1/5*x = -5/7 // : 1/5
x = -5/7/1/5
x = -25/7
x = -25/7
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