8x-4x=21+7

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Solution for 8x-4x=21+7 equation: 



8x-4x=21+7

We move all terms to the left:

8x-4x-(21+7)=0

We add all the numbers together, and all the variables

8x-4x-28=0

We add all the numbers together, and all the variables

4x-28=0

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

4x=28

x=28/4

x=7

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