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7+3=7(D+9)
We move all terms to the left:
7+3-(7(D+9))=0
We add all the numbers together, and all the variables
-(7(D+9))+10=0
We calculate terms in parentheses: -(7(D+9)), so:We get rid of parentheses
7(D+9)
We multiply parentheses
7D+63
Back to the equation:
-(7D+63)
-7D-63+10=0
We add all the numbers together, and all the variables
-7D-53=0
We move all terms containing D to the left, all other terms to the right
-7D=53
D=53/-7
D=-7+4/7
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