-3(7x+5)=-21x-15

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Solution for -3(7x+5)=-21x-15 equation: 



-3(7x+5)=-21x-15

We move all terms to the left:

-3(7x+5)-(-21x-15)=0

We multiply parentheses

-21x-(-21x-15)-15=0

We get rid of parentheses

-21x+21x+15-15=0

We add all the numbers together, and all the variables

=0

x=0/1

x=0

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