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d in (-oo:+oo)
2*d-((2/3)*d)+1/2 = -5/6 // + -5/6
2*d-((2/3)*d)+1/2-(-5/6) = 0
(-2/3)*d+2*d+1/2+5/6 = 0
4/3*d+4/3 = 0 // - 4/3
4/3*d = -4/3 // : 4/3
d = -4/3/4/3
d = -1
d = -1
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