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-43=5a+7
We move all terms to the left:
-43-(5a+7)=0
We get rid of parentheses
-5a-7-43=0
We add all the numbers together, and all the variables
-5a-50=0
We move all terms containing a to the left, all other terms to the right
-5a=50
a=50/-5
a=-10
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