45=21-7x

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Solution for 45=21-7x equation: 



45=21-7x

We move all terms to the left:

45-(21-7x)=0

We add all the numbers together, and all the variables

-(-7x+21)+45=0

We get rid of parentheses

7x-21+45=0

We add all the numbers together, and all the variables

7x+24=0

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

7x=-24

x=-24/7

x=-3+3/7

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