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10x+(12x+8)-x=21x+8
We move all terms to the left:
10x+(12x+8)-x-(21x+8)=0
We add all the numbers together, and all the variables
9x+(12x+8)-(21x+8)=0
We get rid of parentheses
9x+12x-21x+8-8=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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