7x+8=21x+15

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Solution for 7x+8=21x+15 equation: 



7x+8=21x+15

We move all terms to the left:

7x+8-(21x+15)=0

We get rid of parentheses

7x-21x-15+8=0

We add all the numbers together, and all the variables

-14x-7=0

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

-14x=7

x=7/-14

x=-1/2

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