6d = c
Divide both sides by 6:
d = c/d
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If -6d = 42 then 6d = -42. then divide by 6, d = -7
If: a = b+c+d Then: c = a-b-d
72-6d=6 subtract 72 from both sides -6d=66 divide by -6 d=-11
c= (a+d) / 2b
9d-19=6d+2 ... add 19 to both sides and subtract 6d from both sides... 9d-6d=2+19 3d=21 d=21/3 d=7