First, line them up. It should look like c + 38.06 = 74.2. Then, place down - under the + sign, and put down 38.06 under 38.06. Then, put down the = sign, and subtract 38.06 - 74.2 by 74.2 on top and 38.06 on the bottom. The answer I got was 36.14.
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Because there is no way to define the divisors, the equations cannot be evaluated.
a=24 b=16 c=18
a = 20 b = 60 c = 100
z remains undefined.
A+c= 2a+b