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n in (-oo:+oo)
(-1/4)*n-10 = -139/14 // + -139/14
(-1/4)*n-(-139/14)-10 = 0
(-1/4)*n+139/14-10 = 0
-1/4*n-1/14 = 0 // + 1/14
-1/4*n = 1/14 // : -1/4
n = 1/14/(-1/4)
n = -2/7
n = -2/7
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