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n in (-oo:+oo)
(2*n-7)/3 = 15 // - 15
(2*n-7)/3-15 = 0
(2*n-7)/3+(-15*3)/3 = 0
2*n-15*3-7 = 0
2*n-52 = 0
(2*n-52)/3 = 0
(2*n-52)/3 = 0 // * 3
2*n-52 = 0
2*n-52 = 0 // + 52
2*n = 52 // : 2
n = 52/2
n = 26
n = 26
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