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n in (-oo:+oo)
(-2/3)*n-(5/7) = -139/126 // + -139/126
(-2/3)*n-(5/7)-(-139/126) = 0
(-2/3)*n-5/7+139/126 = 0
7/18-2/3*n = 0 // - 7/18
-2/3*n = -7/18 // : -2/3
n = -7/18/(-2/3)
n = 7/12
n = 7/12
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