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x in (-oo:+oo)
x+(5/7)*x+5/7 = -1 // + 1
x+(5/7)*x+5/7+1 = 0
12/7*x+12/7 = 0 // - 12/7
12/7*x = -12/7 // : 12/7
x = -12/7/12/7
x = -1
x = -1
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