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6(7a+3)=186
We move all terms to the left:
6(7a+3)-(186)=0
We multiply parentheses
42a+18-186=0
We add all the numbers together, and all the variables
42a-168=0
We move all terms containing a to the left, all other terms to the right
42a=168
a=168/42
a=4
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