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18a+9=10a+50

We move all terms to the left:

18a+9-(10a+50)=0

We get rid of parentheses

18a-10a-50+9=0

We add all the numbers together, and all the variables

8a-41=0

We move all terms containing a to the left, all other terms to the right

8a=41

a=41/8

a=5+1/8

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