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6(a-10)=-30
We move all terms to the left:
6(a-10)-(-30)=0
We add all the numbers together, and all the variables
6(a-10)+30=0
We multiply parentheses
6a-60+30=0
We add all the numbers together, and all the variables
6a-30=0
We move all terms containing a to the left, all other terms to the right
6a=30
a=30/6
a=5
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