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