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-3a-6.5=4a+7.5
We move all terms to the left:
-3a-6.5-(4a+7.5)=0
We get rid of parentheses
-3a-4a-7.5-6.5=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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