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121=4d-19
We move all terms to the left:
121-(4d-19)=0
We get rid of parentheses
-4d+19+121=0
We add all the numbers together, and all the variables
-4d+140=0
We move all terms containing d to the left, all other terms to the right
-4d=-140
d=-140/-4
d=+35
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