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87=4x+13
We move all terms to the left:
87-(4x+13)=0
We get rid of parentheses
-4x-13+87=0
We add all the numbers together, and all the variables
-4x+74=0
We move all terms containing x to the left, all other terms to the right
-4x=-74
x=-74/-4
x=18+1/2
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