340+7x=640-8x

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Solution for 340+7x=640-8x equation: 



340+7x=640-8x

We move all terms to the left:

340+7x-(640-8x)=0

We add all the numbers together, and all the variables

7x-(-8x+640)+340=0

We get rid of parentheses

7x+8x-640+340=0

We add all the numbers together, and all the variables

15x-300=0

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

15x=300

x=300/15

x=20

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