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400+10x=500+8x
We move all terms to the left:
400+10x-(500+8x)=0
We add all the numbers together, and all the variables
10x-(8x+500)+400=0
We get rid of parentheses
10x-8x-500+400=0
We add all the numbers together, and all the variables
2x-100=0
We move all terms containing x to the left, all other terms to the right
2x=100
x=100/2
x=50
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