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23x+21=42x+16
We move all terms to the left:
23x+21-(42x+16)=0
We get rid of parentheses
23x-42x-16+21=0
We add all the numbers together, and all the variables
-19x+5=0
We move all terms containing x to the left, all other terms to the right
-19x=-5
x=-5/-19
x=5/19
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