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78=3(d-43)
We move all terms to the left:
78-(3(d-43))=0
We calculate terms in parentheses: -(3(d-43)), so:We get rid of parentheses
3(d-43)
We multiply parentheses
3d-129
Back to the equation:
-(3d-129)
-3d+129+78=0
We add all the numbers together, and all the variables
-3d+207=0
We move all terms containing d to the left, all other terms to the right
-3d=-207
d=-207/-3
d=+69
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