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5x-21=10x+4
We move all terms to the left:
5x-21-(10x+4)=0
We get rid of parentheses
5x-10x-4-21=0
We add all the numbers together, and all the variables
-5x-25=0
We move all terms containing x to the left, all other terms to the right
-5x=25
x=25/-5
x=-5
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