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d in (-oo:+oo)
3*d-18 = (7*d)/4+2 // - (7*d)/4+2
3*d-((7*d)/4)-18-2 = 0
3*d+(-7/4)*d-18-2 = 0
5/4*d-20 = 0 // + 20
5/4*d = 20 // : 5/4
d = 20/5/4
d = 16
d = 16
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