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5(6+6a)=150
We move all terms to the left:
5(6+6a)-(150)=0
We add all the numbers together, and all the variables
5(6a+6)-150=0
We multiply parentheses
30a+30-150=0
We add all the numbers together, and all the variables
30a-120=0
We move all terms containing a to the left, all other terms to the right
30a=120
a=120/30
a=4
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