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n in (-oo:+oo)
7/10-4*n = 19/20-7*n // - 19/20-7*n
7/10-4*n-(-7*n)-(19/20) = 0
7*n-4*n+7/10-19/20 = 0
3*n-1/4 = 0 // + 1/4
3*n = 1/4 // : 3
n = 1/4/3
n = 1/12
n = 1/12
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