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23x+11=+14x+21=90
We move all terms to the left:
23x+11-(+14x+21)=0
We add all the numbers together, and all the variables
23x-(14x+21)+11=0
We get rid of parentheses
23x-14x-21+11=0
We add all the numbers together, and all the variables
9x-10=0
We move all terms containing x to the left, all other terms to the right
9x=10
x=10/9
x=1+1/9
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