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49.10=5+2.10a
We move all terms to the left:
49.10-(5+2.10a)=0
We add all the numbers together, and all the variables
-(2.10a+5)+49.10=0
We add all the numbers together, and all the variables
-(2.10a+5)+49.1=0
We get rid of parentheses
-2.10a-5+49.1=0
We add all the numbers together, and all the variables
-2.1a+44.1=0
We move all terms containing a to the left, all other terms to the right
-2.1a=-44.1
a=-44.1/-2.1
a=+21
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