7x+21=2x-40

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Solution for 7x+21=2x-40 equation: 



7x+21=2x-40

We move all terms to the left:

7x+21-(2x-40)=0

We get rid of parentheses

7x-2x+40+21=0

We add all the numbers together, and all the variables

5x+61=0

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

5x=-61

x=-61/5

x=-12+1/5

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