3(2-4x)=90

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Solution for 3(2-4x)=90 equation: 



3(2-4x)=90

We move all terms to the left:

3(2-4x)-(90)=0

We add all the numbers together, and all the variables

3(-4x+2)-90=0

We multiply parentheses

-12x+6-90=0

We add all the numbers together, and all the variables

-12x-84=0

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

-12x=84

x=84/-12

x=-7

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