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x in (-oo:+oo)
(-2/7)*x-(1/2) = -79/126 // + -79/126
(-2/7)*x-(1/2)-(-79/126) = 0
(-2/7)*x-1/2+79/126 = 0
8/63-2/7*x = 0 // - 8/63
-2/7*x = -8/63 // : -2/7
x = -8/63/(-2/7)
x = 4/9
x = 4/9
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