78-x=84-3x

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Solution for 78-x=84-3x equation: 



78-x=84-3x

We move all terms to the left:

78-x-(84-3x)=0

We add all the numbers together, and all the variables

-x-(-3x+84)+78=0

We add all the numbers together, and all the variables

-1x-(-3x+84)+78=0

We get rid of parentheses

-1x+3x-84+78=0

We add all the numbers together, and all the variables

2x-6=0

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

2x=6

x=6/2

x=3

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