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40.3=2a+1.87
We move all terms to the left:
40.3-(2a+1.87)=0
We get rid of parentheses
-2a-1.87+40.3=0
We add all the numbers together, and all the variables
-2a+38.43=0
We move all terms containing a to the left, all other terms to the right
-2a=-38.43
a=-38.43/-2
a=19+0.43/2
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