a+21+2a=7-4a

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Solution for a+21+2a=7-4a equation:



a+21+2a=7-4a
We move all terms to the left:
a+21+2a-(7-4a)=0
We add all the numbers together, and all the variables
a+2a-(-4a+7)+21=0
We add all the numbers together, and all the variables
3a-(-4a+7)+21=0
We get rid of parentheses
3a+4a-7+21=0
We add all the numbers together, and all the variables
7a+14=0
We move all terms containing a to the left, all other terms to the right
7a=-14
a=-14/7
a=-2

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