2/7(7x-21)

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Solution for 2/7(7x-21) equation: 


x in (-oo:+oo)

(2/7)*(7*x-21) = 0

2/7*(7*x-21) = 0

7*x-21 = 0 // + 21

7*x = 21 // : 7

x = 21/7

x = 3

x = 3

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