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13a+50=23a-100
We move all terms to the left:
13a+50-(23a-100)=0
We get rid of parentheses
13a-23a+100+50=0
We add all the numbers together, and all the variables
-10a+150=0
We move all terms containing a to the left, all other terms to the right
-10a=-150
a=-150/-10
a=+15
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