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n in (-oo:+oo)
(3*n-2)/5 = 7/10 // - 7/10
(3*n-2)/5-(7/10) = 0
(3*n-2)/5-7/10 = 0
(10*(3*n-2))/(5*10)+(-7*5)/(5*10) = 0
10*(3*n-2)-7*5 = 0
30*n-55 = 0
(30*n-55)/(5*10) = 0
(30*n-55)/(5*10) = 0 // * 5*10
30*n-55 = 0
30*n-55 = 0 // + 55
30*n = 55 // : 30
n = 55/30
n = 11/6
n = 11/6
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