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

-(1.8x-15.5)+20.5=0

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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