A light year is = to 9.461 × 1015 metres
the enclosed may help. earth rotes and you and i are fixed to it. air flows it's own path ...
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You first distribute 8 through the parenthesis so it’s 24b+24=5b+5
Then collect the like terms to calculate 24b-5b=5-24 you then subtract so now it’s 19b=-9
So now you divide and your answer is b=-1