40=20+a*30

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Solution for 40=20+a*30 equation: 



40=20+a*30

We move all terms to the left:

40-(20+a*30)=0

We add all the numbers together, and all the variables

-(a*30+20)+40=0

We get rid of parentheses

-a*30-20+40=0

We add all the numbers together, and all the variables

-a*30+20=0

Wy multiply elements

-30a+20=0

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

-30a=-20

a=-20/-30

a=2/3

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