40=12x+8x

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Solution for 40=12x+8x equation: 



40=12x+8x

We move all terms to the left:

40-(12x+8x)=0

We add all the numbers together, and all the variables

-(+20x)+40=0

We get rid of parentheses

-20x+40=0

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

-20x=-40

x=-40/-20

x=+2

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