20=1.8+a

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Solution for 20=1.8+a equation: 



20=1.8+a

We move all terms to the left:

20-(1.8+a)=0

We add all the numbers together, and all the variables

-(a+1.8)+20=0

We get rid of parentheses

-a-1.8+20=0

We add all the numbers together, and all the variables

-1a+18.2=0

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

-a=-18.2

a=-18.2/-1

a=18+0.2/1

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