3+4.75a=21

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Solution for 3+4.75a=21 equation: 



3+4.75a=21

We move all terms to the left:

3+4.75a-(21)=0

We add all the numbers together, and all the variables

4.75a-18=0

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

4.75a=18

a=18/4.75

a=3+2.14285714286/2.71428571429

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