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3(2d - 7) = (2 + 4d)2
distribute
3*2d -3*7 = 2*2 +2*4d
multiply
6d -21 = 4 +8d
subtract 6d from each side
6d-6d-21 = 4 +8d-6d
-21 = 4+2d
subtract 4 from each side
-21 -4 =4+2d-4
-25 =2d
divide by 2
-25/2 =d
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