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12.54(x)-12.30(x)=840
We move all terms to the left:
12.54(x)-12.30(x)-(840)=0
We add all the numbers together, and all the variables
0.24x-840=0
We move all terms containing x to the left, all other terms to the right
0.24x=840
x=840/0.24
x=3500
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