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x-40+(x-400)40=400
We move all terms to the left:
x-40+(x-400)40-(400)=0
We add all the numbers together, and all the variables
x+(x-400)40-440=0
We multiply parentheses
x+40x-16000-440=0
We add all the numbers together, and all the variables
41x-16440=0
We move all terms containing x to the left, all other terms to the right
41x=16440
x=16440/41
x=400+40/41
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