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4=0.4(d-5)
We move all terms to the left:
4-(0.4(d-5))=0
We calculate terms in parentheses: -(0.4(d-5)), so:We get rid of parentheses
0.4(d-5)
We multiply parentheses
0.4d-2
Back to the equation:
-(0.4d-2)
-0.4d+2+4=0
We add all the numbers together, and all the variables
-0.4d+6=0
We move all terms containing d to the left, all other terms to the right
-0.4d=-6
d=-6/-0.4
d=+15
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