1.5+1.5a=21

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Solution for 1.5+1.5a=21 equation: 



1.5+1.5a=21

We move all terms to the left:

1.5+1.5a-(21)=0

We add all the numbers together, and all the variables

1.5a-19.5=0

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

1.5a=19.5

a=19.5/1.5

a=13

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