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-6(5-8a)=258
We move all terms to the left:
-6(5-8a)-(258)=0
We add all the numbers together, and all the variables
-6(-8a+5)-258=0
We multiply parentheses
48a-30-258=0
We add all the numbers together, and all the variables
48a-288=0
We move all terms containing a to the left, all other terms to the right
48a=288
a=288/48
a=6
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