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10.50a+3.75*82=2071.50.a
We move all terms to the left:
10.50a+3.75*82-(2071.50.a)=0
We add all the numbers together, and all the variables
10.50a-0+3.75*82=0
We add all the numbers together, and all the variables
10.50a+307.5=0
We move all terms containing a to the left, all other terms to the right
10.50a=-307.5
a=-307.5/10.50
a=-29+3/10.50
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