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.12(x-4200)=3000
We move all terms to the left:
.12(x-4200)-(3000)=0
We multiply parentheses
0.12x-504-3000=0
We add all the numbers together, and all the variables
0.12x-3504=0
We move all terms containing x to the left, all other terms to the right
0.12x=3504
x=3504/0.12
x=29200
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