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72=10a-3
We move all terms to the left:
72-(10a-3)=0
We get rid of parentheses
-10a+3+72=0
We add all the numbers together, and all the variables
-10a+75=0
We move all terms containing a to the left, all other terms to the right
-10a=-75
a=-75/-10
a=7+1/2
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