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21x-1=8x*7
We move all terms to the left:
21x-1-(8x*7)=0
We add all the numbers together, and all the variables
21x-(+8x*7)-1=0
We get rid of parentheses
21x-8x*7-1=0
Wy multiply elements
21x-56x-1=0
We add all the numbers together, and all the variables
-35x-1=0
We move all terms containing x to the left, all other terms to the right
-35x=1
x=1/-35
x=-1/35
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