45=12u-7u

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Solution for 45=12u-7u equation: 



45=12u-7u

We move all terms to the left:

45-(12u-7u)=0

We add all the numbers together, and all the variables

-(+5u)+45=0

We get rid of parentheses

-5u+45=0

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

-5u=-45

u=-45/-5

u=+9

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