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x in (-oo:+oo)
(-5/7)*x = -5/63 // + -5/63
(-5/7)*x-(-5/63) = 0
(-5/7)*x+5/63 = 0
5/63-5/7*x = 0 // - 5/63
-5/7*x = -5/63 // : -5/7
x = -5/63/(-5/7)
x = 1/9
x = 1/9
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