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170+0.40a=80+0.70a
We move all terms to the left:
170+0.40a-(80+0.70a)=0
We add all the numbers together, and all the variables
0.40a-(0.70a+80)+170=0
We get rid of parentheses
0.40a-0.70a-80+170=0
We add all the numbers together, and all the variables
-0.3a+90=0
We move all terms containing a to the left, all other terms to the right
-0.3a=-90
a=-90/-0.3
a=+300
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