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d+3=4(d+9)
We move all terms to the left:
d+3-(4(d+9))=0
We calculate terms in parentheses: -(4(d+9)), so:We get rid of parentheses
4(d+9)
We multiply parentheses
4d+36
Back to the equation:
-(4d+36)
d-4d-36+3=0
We add all the numbers together, and all the variables
-3d-33=0
We move all terms containing d to the left, all other terms to the right
-3d=33
d=33/-3
d=-11
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