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2x+90=900+1x
We move all terms to the left:
2x+90-(900+1x)=0
We add all the numbers together, and all the variables
2x-(x+900)+90=0
We get rid of parentheses
2x-x-900+90=0
We add all the numbers together, and all the variables
x-810=0
We move all terms containing x to the left, all other terms to the right
x=810
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