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10x-1=8x/21
We move all terms to the left:
10x-1-(8x/21)=0
We add all the numbers together, and all the variables
10x-(+8x/21)-1=0
We get rid of parentheses
10x-8x/21-1=0
We multiply all the terms by the denominator
10x*21-8x-1*21=0
We add all the numbers together, and all the variables
-8x+10x*21-21=0
Wy multiply elements
-8x+210x-21=0
We add all the numbers together, and all the variables
202x-21=0
We move all terms containing x to the left, all other terms to the right
202x=21
x=21/202
x=21/202
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