13x-3(2x-5)=21

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Solution for 13x-3(2x-5)=21 equation: 



13x-3(2x-5)=21

We move all terms to the left:

13x-3(2x-5)-(21)=0

We multiply parentheses

13x-6x+15-21=0

We add all the numbers together, and all the variables

7x-6=0

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

7x=6

x=6/7

x=6/7

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