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74=7a+11
We move all terms to the left:
74-(7a+11)=0
We get rid of parentheses
-7a-11+74=0
We add all the numbers together, and all the variables
-7a+63=0
We move all terms containing a to the left, all other terms to the right
-7a=-63
a=-63/-7
a=+9
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