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100+5x=300-4x
We move all terms to the left:
100+5x-(300-4x)=0
We add all the numbers together, and all the variables
5x-(-4x+300)+100=0
We get rid of parentheses
5x+4x-300+100=0
We add all the numbers together, and all the variables
9x-200=0
We move all terms containing x to the left, all other terms to the right
9x=200
x=200/9
x=22+2/9
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