Hi,

solving

5/7(x+21)= 30  mulitplying each side of the equation by 7 so as all denominators = 1

 5(x+21) = 30*7

 5x + 105 = 210

     5x = 105

      x = 21



CHECKING our Answer

5/7(42) = 30 

Answer by rfer(16322)   (Show Source): You can put this solution on YOUR website!
 5/7x+5/7*21=30

5/7x+105/7=30

5/7x+15=30

subtract 15

5/7x=15

divide by 5/7

x=15/(5/7)

x=15*(7/5)

x=105/5

x=21 

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