7x-9=21+x - solution

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Solution for 7x-9=21+x equation:

x in (-oo:+oo)

7*x-9 = x+21 // - x+21

7*x-x-21-9 = 0

6*x-30 = 0 // + 30

6*x = 30 // : 6

x = 30/6

x = 5

x = 5

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