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7=3(d+1)-2
We move all terms to the left:
7-(3(d+1)-2)=0
We calculate terms in parentheses: -(3(d+1)-2), so:We get rid of parentheses
3(d+1)-2
We multiply parentheses
3d+3-2
We add all the numbers together, and all the variables
3d+1
Back to the equation:
-(3d+1)
-3d-1+7=0
We add all the numbers together, and all the variables
-3d+6=0
We move all terms containing d to the left, all other terms to the right
-3d=-6
d=-6/-3
d=+2
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