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288=8(1-5r)
We move all terms to the left:
288-(8(1-5r))=0
We add all the numbers together, and all the variables
-(8(-5r+1))+288=0
We calculate terms in parentheses: -(8(-5r+1)), so:We get rid of parentheses
8(-5r+1)
We multiply parentheses
-40r+8
Back to the equation:
-(-40r+8)
40r-8+288=0
We add all the numbers together, and all the variables
40r+280=0
We move all terms containing r to the left, all other terms to the right
40r=-280
r=-280/40
r=-7
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