21x-81=10x+40

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Solution for 21x-81=10x+40 equation: 



21x-81=10x+40

We move all terms to the left:

21x-81-(10x+40)=0

We get rid of parentheses

21x-10x-40-81=0

We add all the numbers together, and all the variables

11x-121=0

We move all terms containing x to the left, all other terms to the right

11x=121

x=121/11

x=11

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