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6x-10=21x+5
We move all terms to the left:
6x-10-(21x+5)=0
We get rid of parentheses
6x-21x-5-10=0
We add all the numbers together, and all the variables
-15x-15=0
We move all terms containing x to the left, all other terms to the right
-15x=15
x=15/-15
x=-1
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