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15a-15=16.2+11a
We move all terms to the left:
15a-15-(16.2+11a)=0
We add all the numbers together, and all the variables
15a-(11a+16.2)-15=0
We get rid of parentheses
15a-11a-16.2-15=0
We add all the numbers together, and all the variables
4a-31.2=0
We move all terms containing a to the left, all other terms to the right
4a=31.2
a=31.2/4
a=7+2.66666666667/3.33333333333
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