45+x=3(7+x)

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Solution for 45+x=3(7+x) equation: 



45+x=3(7+x)

We move all terms to the left:

45+x-(3(7+x))=0

We add all the numbers together, and all the variables

x-(3(x+7))+45=0



We calculate terms in parentheses: -(3(x+7)), so:

3(x+7)

We multiply parentheses

3x+21

Back to the equation:

-(3x+21)



We get rid of parentheses

x-3x-21+45=0

We add all the numbers together, and all the variables

-2x+24=0

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

-2x=-24

x=-24/-2

x=+12

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