20.5=-15.5-(3.6x-1.8x)

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Solution for 20.5=-15.5-(3.6x-1.8x) equation: 



20.5=-15.5-(3.6x-1.8x)

We move all terms to the left:

20.5-(-15.5-(3.6x-1.8x))=0

We add all the numbers together, and all the variables

-(-15.5-(+1.8x))+20.5=0



We calculate terms in parentheses: -(-15.5-(+1.8x)), so:

-15.5-(+1.8x)

determiningTheFunctionDomain
-(+1.8x)-15.5

We get rid of parentheses

-1.8x-15.5

Back to the equation:

-(-1.8x-15.5)



We get rid of parentheses

1.8x+15.5+20.5=0

We add all the numbers together, and all the variables

1.8x+36=0

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

1.8x=-36

x=-36/1.8

x=-20

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