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n in (-oo:+oo)
2*(7*n+3) = -36 // + 36
2*(7*n+3)+36 = 0
2*(7*n+3)+36 = 0
14*n+42 = 0
14*n+42 = 0
14*n+42 = 0 // - 42
14*n = -42 // : 14
n = -42/14
n = -3
n = -3
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