45=9x-4x

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Solution for 45=9x-4x equation: 



45=9x-4x

We move all terms to the left:

45-(9x-4x)=0

We add all the numbers together, and all the variables

-(+5x)+45=0

We get rid of parentheses

-5x+45=0

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

-5x=-45

x=-45/-5

x=+9

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