x-30=4x-84

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Solution for x-30=4x-84 equation: 



x-30=4x-84

We move all terms to the left:

x-30-(4x-84)=0

We get rid of parentheses

x-4x+84-30=0

We add all the numbers together, and all the variables

-3x+54=0

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

-3x=-54

x=-54/-3

x=+18

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