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7a=-23.4+4a
We move all terms to the left:
7a-(-23.4+4a)=0
We add all the numbers together, and all the variables
7a-(4a-23.4)=0
We get rid of parentheses
7a-4a+23.4=0
We add all the numbers together, and all the variables
3a+23.4=0
We move all terms containing a to the left, all other terms to the right
3a=-23.4
a=-23.4/3
a=-7+2.4/3
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