15x+3=7x-21

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Solution for 15x+3=7x-21 equation: 



15x+3=7x-21

We move all terms to the left:

15x+3-(7x-21)=0

We get rid of parentheses

15x-7x+21+3=0

We add all the numbers together, and all the variables

8x+24=0

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

8x=-24

x=-24/8

x=-3

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