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100x+25(63-x)=3000
We move all terms to the left:
100x+25(63-x)-(3000)=0
We add all the numbers together, and all the variables
100x+25(-1x+63)-3000=0
We multiply parentheses
100x-25x+1575-3000=0
We add all the numbers together, and all the variables
75x-1425=0
We move all terms containing x to the left, all other terms to the right
75x=1425
x=1425/75
x=19
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