6x+(-90)=-21x

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Solution for 6x+(-90)=-21x equation: 



6x+(-90)=-21x

We move all terms to the left:

6x+(-90)-(-21x)=0

We add all the numbers together, and all the variables

6x-(-21x)-90=0

We get rid of parentheses

6x+21x-90=0

We add all the numbers together, and all the variables

27x-90=0

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

27x=90

x=90/27

x=3+1/3

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