45=4x+5x

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Solution for 45=4x+5x equation: 



45=4x+5x

We move all terms to the left:

45-(4x+5x)=0

We add all the numbers together, and all the variables

-(+9x)+45=0

We get rid of parentheses

-9x+45=0

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

-9x=-45

x=-45/-9

x=+5

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