45=15+k

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Solution for 45=15+k equation: 



45=15+k

We move all terms to the left:

45-(15+k)=0

We add all the numbers together, and all the variables

-(k+15)+45=0

We get rid of parentheses

-k-15+45=0

We add all the numbers together, and all the variables

-1k+30=0

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

-k=-30

k=-30/-1

k=+30

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