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8-15-6a=85-3a
We move all terms to the left:
8-15-6a-(85-3a)=0
We add all the numbers together, and all the variables
-6a-(-3a+85)+8-15=0
We add all the numbers together, and all the variables
-6a-(-3a+85)-7=0
We get rid of parentheses
-6a+3a-85-7=0
We add all the numbers together, and all the variables
-3a-92=0
We move all terms containing a to the left, all other terms to the right
-3a=92
a=92/-3
a=-30+2/3
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