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y in (-oo:+oo)
2/7-(3/7) = (-6/7)*y-((3/7)*y) // - (-6/7)*y-((3/7)*y)
(3/7)*y-((-6/7)*y)+2/7-(3/7) = 0
(6/7)*y+(3/7)*y+2/7-3/7 = 0
9/7*y-1/7 = 0 // + 1/7
9/7*y = 1/7 // : 9/7
y = 1/7/9/7
y = 1/9
y = 1/9
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