40=1x+3x

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Solution for 40=1x+3x equation: 



40=1x+3x

We move all terms to the left:

40-(1x+3x)=0

We add all the numbers together, and all the variables

-(+4x)+40=0

We get rid of parentheses

-4x+40=0

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

-4x=-40

x=-40/-4

x=+10

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