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1280-5x=1600-9x
We move all terms to the left:
1280-5x-(1600-9x)=0
We add all the numbers together, and all the variables
-5x-(-9x+1600)+1280=0
We get rid of parentheses
-5x+9x-1600+1280=0
We add all the numbers together, and all the variables
4x-320=0
We move all terms containing x to the left, all other terms to the right
4x=320
x=320/4
x=80
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