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-25=-7(4r+3)
We move all terms to the left:
-25-(-7(4r+3))=0
We calculate terms in parentheses: -(-7(4r+3)), so:We get rid of parentheses
-7(4r+3)
We multiply parentheses
-28r-21
Back to the equation:
-(-28r-21)
28r+21-25=0
We add all the numbers together, and all the variables
28r-4=0
We move all terms containing r to the left, all other terms to the right
28r=4
r=4/28
r=1/7
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