-77=4x-21x+42

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Solution for -77=4x-21x+42 equation: 



-77=4x-21x+42

We move all terms to the left:

-77-(4x-21x+42)=0

We add all the numbers together, and all the variables

-(-17x+42)-77=0

We get rid of parentheses

17x-42-77=0

We add all the numbers together, and all the variables

17x-119=0

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

17x=119

x=119/17

x=7

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