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4x+8(250-x)=1000
We move all terms to the left:
4x+8(250-x)-(1000)=0
We add all the numbers together, and all the variables
4x+8(-1x+250)-1000=0
We multiply parentheses
4x-8x+2000-1000=0
We add all the numbers together, and all the variables
-4x+1000=0
We move all terms containing x to the left, all other terms to the right
-4x=-1000
x=-1000/-4
x=+250
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