7x-28=15*21

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Solution for 7x-28=15*21 equation: 



7x-28=15*21

We move all terms to the left:

7x-28-(15*21)=0

We add all the numbers together, and all the variables

7x-28-315=0

We add all the numbers together, and all the variables

7x-343=0

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

7x=343

x=343/7

x=49

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