6-4a=21

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Solution for 6-4a=21 equation:



6-4a=21
We move all terms to the left:
6-4a-(21)=0
We add all the numbers together, and all the variables
-4a-15=0
We move all terms containing a to the left, all other terms to the right
-4a=15
a=15/-4
a=-3+3/4

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