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25+r=-5(2+8r)
We move all terms to the left:
25+r-(-5(2+8r))=0
We add all the numbers together, and all the variables
r-(-5(8r+2))+25=0
We calculate terms in parentheses: -(-5(8r+2)), so:We get rid of parentheses
-5(8r+2)
We multiply parentheses
-40r-10
Back to the equation:
-(-40r-10)
r+40r+10+25=0
We add all the numbers together, and all the variables
41r+35=0
We move all terms containing r to the left, all other terms to the right
41r=-35
r=-35/41
r=-35/41
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