(42-21x)+12x=4

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Solution for (42-21x)+12x=4 equation: 



(42-21x)+12x=4

We move all terms to the left:

(42-21x)+12x-(4)=0

We add all the numbers together, and all the variables

(-21x+42)+12x-4=0

We add all the numbers together, and all the variables

12x+(-21x+42)-4=0

We get rid of parentheses

12x-21x+42-4=0

We add all the numbers together, and all the variables

-9x+38=0

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

-9x=-38

x=-38/-9

x=4+2/9

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