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2.4a+1.2a-6.5=0.7
We move all terms to the left:
2.4a+1.2a-6.5-(0.7)=0
We add all the numbers together, and all the variables
3.6a-7.2=0
We move all terms containing a to the left, all other terms to the right
3.6a=7.2
a=7.2/3.6
a=2
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