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d in (-oo:+oo)
(22-d)/3 = -7 // + 7
(22-d)/3+7 = 0
(22-d)/3+(3*7)/3 = 0
3*7-d+22 = 0
43-d = 0
(43-d)/3 = 0
(43-d)/3 = 0 // * 3
43-d = 0
43-d = 0 // - 43
-d = -43 // * -1
d = 43
d = 43
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