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40x-1200=400+50x
We move all terms to the left:
40x-1200-(400+50x)=0
We add all the numbers together, and all the variables
40x-(50x+400)-1200=0
We get rid of parentheses
40x-50x-400-1200=0
We add all the numbers together, and all the variables
-10x-1600=0
We move all terms containing x to the left, all other terms to the right
-10x=1600
x=1600/-10
x=-160
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