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326=-5r+8(-5r+7)
We move all terms to the left:
326-(-5r+8(-5r+7))=0
We calculate terms in parentheses: -(-5r+8(-5r+7)), so:We get rid of parentheses
-5r+8(-5r+7)
We multiply parentheses
-5r-40r+56
We add all the numbers together, and all the variables
-45r+56
Back to the equation:
-(-45r+56)
45r-56+326=0
We add all the numbers together, and all the variables
45r+270=0
We move all terms containing r to the left, all other terms to the right
45r=-270
r=-270/45
r=-6
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