45-x=3x+21

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



45-x=3x+21

We move all terms to the left:

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

We add all the numbers together, and all the variables

-1x-(3x+21)+45=0

We get rid of parentheses

-1x-3x-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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