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6x=21x-10
We move all terms to the left:
6x-(21x-10)=0
We get rid of parentheses
6x-21x+10=0
We add all the numbers together, and all the variables
-15x+10=0
We move all terms containing x to the left, all other terms to the right
-15x=-10
x=-10/-15
x=2/3
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