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7=1.1a+1.5
We move all terms to the left:
7-(1.1a+1.5)=0
We get rid of parentheses
-1.1a-1.5+7=0
We add all the numbers together, and all the variables
-1.1a+5.5=0
We move all terms containing a to the left, all other terms to the right
-1.1a=-5.5
a=-5.5/-1.1
a=+5
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