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7a+50=14a-70
We move all terms to the left:
7a+50-(14a-70)=0
We get rid of parentheses
7a-14a+70+50=0
We add all the numbers together, and all the variables
-7a+120=0
We move all terms containing a to the left, all other terms to the right
-7a=-120
a=-120/-7
a=17+1/7
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