15x-(3-7x)=21x-4x

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Solution for 15x-(3-7x)=21x-4x equation: 



15x-(3-7x)=21x-4x

We move all terms to the left:

15x-(3-7x)-(21x-4x)=0

We add all the numbers together, and all the variables

15x-(-7x+3)-(+17x)=0

We get rid of parentheses

15x+7x-17x-3=0

We add all the numbers together, and all the variables

5x-3=0

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

5x=3

x=3/5

x=3/5

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