45=21+4x

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Solution for 45=21+4x equation: 



45=21+4x

We move all terms to the left:

45-(21+4x)=0

We add all the numbers together, and all the variables

-(4x+21)+45=0

We get rid of parentheses

-4x-21+45=0

We add all the numbers together, and all the variables

-4x+24=0

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

-4x=-24

x=-24/-4

x=+6

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