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100x+25(63-x)=3.000
We move all terms to the left:
100x+25(63-x)-(3.000)=0
We add all the numbers together, and all the variables
100x+25(-1x+63)-3=0
We multiply parentheses
100x-25x+1575-3=0
We add all the numbers together, and all the variables
75x+1572=0
We move all terms containing x to the left, all other terms to the right
75x=-1572
x=-1572/75
x=-20+24/25
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