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10x+5=21x-6
We move all terms to the left:
10x+5-(21x-6)=0
We get rid of parentheses
10x-21x+6+5=0
We add all the numbers together, and all the variables
-11x+11=0
We move all terms containing x to the left, all other terms to the right
-11x=-11
x=-11/-11
x=1
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