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n in (-oo:+oo)
65/63 = (-3/7)*n+(1/3)*n+1 // - (-3/7)*n+(1/3)*n+1
65/63-((-3/7)*n)-((1/3)*n)-1 = 0
(3/7)*n+(-1/3)*n+65/63-1 = 0
2/21*n+2/63 = 0 // - 2/63
2/21*n = -2/63 // : 2/21
n = -2/63/2/21
n = -1/3
n = -1/3
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