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n in (-oo:+oo)
(3/4)*n-4 = -71/20 // + -71/20
(3/4)*n-(-71/20)-4 = 0
(3/4)*n+71/20-4 = 0
3/4*n-9/20 = 0 // + 9/20
3/4*n = 9/20 // : 3/4
n = 9/20/3/4
n = 3/5
n = 3/5
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