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(a+19)100=100
We move all terms to the left:
(a+19)100-(100)=0
We multiply parentheses
100a+1900-100=0
We add all the numbers together, and all the variables
100a+1800=0
We move all terms containing a to the left, all other terms to the right
100a=-1800
a=-1800/100
a=-18
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