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d in (-oo:+oo)
(-1/6)*d-((1/3)*d)+3/7 = -4/7 // + -4/7
(-1/6)*d-((1/3)*d)+3/7-(-4/7) = 0
(-1/6)*d+(-1/3)*d+3/7+4/7 = 0
1-1/2*d = 0 // - 1
-1/2*d = -1 // : -1/2
d = -1/(-1/2)
d = 2
d = 2
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