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35x+(500-x)45=20500
We move all terms to the left:
35x+(500-x)45-(20500)=0
We add all the numbers together, and all the variables
35x+(-1x+500)45-20500=0
We multiply parentheses
35x-45x+22500-20500=0
We add all the numbers together, and all the variables
-10x+2000=0
We move all terms containing x to the left, all other terms to the right
-10x=-2000
x=-2000/-10
x=+200
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