4.2(15+5x)=20x-21-x

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Solution for 4.2(15+5x)=20x-21-x equation: 



4.2(15+5x)=20x-21-x

We move all terms to the left:

4.2(15+5x)-(20x-21-x)=0

We add all the numbers together, and all the variables

4.2(5x+15)-(19x-21)=0

We multiply parentheses

21x-(19x-21)+63=0

We get rid of parentheses

21x-19x+21+63=0

We add all the numbers together, and all the variables

2x+84=0

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

2x=-84

x=-84/2

x=-42

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