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40=176-0.8a
We move all terms to the left:
40-(176-0.8a)=0
We add all the numbers together, and all the variables
-(-0.8a+176)+40=0
We get rid of parentheses
0.8a-176+40=0
We add all the numbers together, and all the variables
0.8a-136=0
We move all terms containing a to the left, all other terms to the right
0.8a=136
a=136/0.8
a=170
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