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d in (-oo:+oo)
2*d-((2/7)*d)+4 = 100/7 // - 100/7
2*d-((2/7)*d)-(100/7)+4 = 0
2*d+(-2/7)*d-100/7+4 = 0
12/7*d-72/7 = 0 // + 72/7
12/7*d = 72/7 // : 12/7
d = 72/7/12/7
d = 6
d = 6
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