40-x=30+2x

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Solution for 40-x=30+2x equation: 



40-x=30+2x

We move all terms to the left:

40-x-(30+2x)=0

We add all the numbers together, and all the variables

-x-(2x+30)+40=0

We add all the numbers together, and all the variables

-1x-(2x+30)+40=0

We get rid of parentheses

-1x-2x-30+40=0

We add all the numbers together, and all the variables

-3x+10=0

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

-3x=-10

x=-10/-3

x=3+1/3

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