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5(3+6a)=285
We move all terms to the left:
5(3+6a)-(285)=0
We add all the numbers together, and all the variables
5(6a+3)-285=0
We multiply parentheses
30a+15-285=0
We add all the numbers together, and all the variables
30a-270=0
We move all terms containing a to the left, all other terms to the right
30a=270
a=270/30
a=9
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