5x+8-7=21

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Solution for 5x+8-7=21 equation: 



5x+8-7=21

We move all terms to the left:

5x+8-7-(21)=0

We add all the numbers together, and all the variables

5x-20=0

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

5x=20

x=20/5

x=4

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