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5(3a-10)=100
We move all terms to the left:
5(3a-10)-(100)=0
We multiply parentheses
15a-50-100=0
We add all the numbers together, and all the variables
15a-150=0
We move all terms containing a to the left, all other terms to the right
15a=150
a=150/15
a=10
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