-3x+45=x+21

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Solution for -3x+45=x+21 equation: 



-3x+45=x+21

We move all terms to the left:

-3x+45-(x+21)=0

We get rid of parentheses

-3x-x-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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