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x*100+(63-x)*25=3000
We move all terms to the left:
x*100+(63-x)*25-(3000)=0
We add all the numbers together, and all the variables
x*100+(-1x+63)*25-3000=0
We multiply parentheses
x*100-25x+1575-3000=0
Wy multiply elements
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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