42+21x=6x+12

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Solution for 42+21x=6x+12 equation: 



42+21x=6x+12

We move all terms to the left:

42+21x-(6x+12)=0

We get rid of parentheses

21x-6x-12+42=0

We add all the numbers together, and all the variables

15x+30=0

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

15x=-30

x=-30/15

x=-2

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