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(3/5)*(15*d+20)-((1/6)*(18*d-12)) = 28 // - 28
(3/5)*(15*d+20)-((1/6)*(18*d-12))-28 = 0
(3/5)*(15*d+20)+(-1/6)*(18*d-12)-28 = 0
3/5*(15*d+20)-1/6*(18*d-12)-28 = 0
3/5*(15*d+20)-1/6*(18*d-12)-28 = 0
6*d-28+14 = 0
6*d-14 = 0
6*d-14 = 0
6*d-14 = 0 // + 14
6*d = 14 // : 6
d = 14/6
d = 7/3
d = 7/3
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