Respuesta :

You want to make it so all of the integers are on one side and all of the variables are on the other.
So.
1/7(105+r)=20
Opening up the parenthesis:
1/7 * 105 + 1/7 * r = 20
15 + 1/7r = 20
-15              -15
1/7r = 5
*7       *7
r = 35

So r equals 35.

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