r/4+9=21

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Solution for r/4+9=21 equation: 



r/4+9=21

We move all terms to the left:

r/4+9-(21)=0

We add all the numbers together, and all the variables

r/4-12=0

We multiply all the terms by the denominator


r-12*4=0

We add all the numbers together, and all the variables

r-48=0

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

r=48

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