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4(x-2100)=90156
We move all terms to the left:
4(x-2100)-(90156)=0
We multiply parentheses
4x-8400-90156=0
We add all the numbers together, and all the variables
4x-98556=0
We move all terms containing x to the left, all other terms to the right
4x=98556
x=98556/4
x=24639
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