x+21=2x-66

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Solution for x+21=2x-66 equation: 



x+21=2x-66

We move all terms to the left:

x+21-(2x-66)=0

We get rid of parentheses

x-2x+66+21=0

We add all the numbers together, and all the variables

-1x+87=0

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

-x=-87

x=-87/-1

x=+87

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