Hi, there.
_____
First off, distribute 3 through parentheses.
Next, add 21 to both sides.
Divide both sides by 3.
Hope the answer - and explanation - made sense,
happy studying.
3(r-7)=24
Multiply bracket out
3r - 21 = 24
+21
3r. = 45
÷ 3
r = 15
Hope this helps!
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