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19+4r=-3(7+2r)
We move all terms to the left:
19+4r-(-3(7+2r))=0
We add all the numbers together, and all the variables
4r-(-3(2r+7))+19=0
We calculate terms in parentheses: -(-3(2r+7)), so:We get rid of parentheses
-3(2r+7)
We multiply parentheses
-6r-21
Back to the equation:
-(-6r-21)
4r+6r+21+19=0
We add all the numbers together, and all the variables
10r+40=0
We move all terms containing r to the left, all other terms to the right
10r=-40
r=-40/10
r=-4
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