45-2r=21

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Solution for 45-2r=21 equation: 



45-2r=21

We move all terms to the left:

45-2r-(21)=0

We add all the numbers together, and all the variables

-2r+24=0

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

-2r=-24

r=-24/-2

r=+12

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