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5(6-3a)=105
We move all terms to the left:
5(6-3a)-(105)=0
We add all the numbers together, and all the variables
5(-3a+6)-105=0
We multiply parentheses
-15a+30-105=0
We add all the numbers together, and all the variables
-15a-75=0
We move all terms containing a to the left, all other terms to the right
-15a=75
a=75/-15
a=-5
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