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-9a-26=-46-7a
We move all terms to the left:
-9a-26-(-46-7a)=0
We add all the numbers together, and all the variables
-9a-(-7a-46)-26=0
We get rid of parentheses
-9a+7a+46-26=0
We add all the numbers together, and all the variables
-2a+20=0
We move all terms containing a to the left, all other terms to the right
-2a=-20
a=-20/-2
a=+10