1+6x=x+21 - solution

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Solution for 1+6x=x+21 equation:

x in (-oo:+oo)

6*x+1 = x+21 // - x+21

6*x-x-21+1 = 0

5*x-20 = 0 // + 20

5*x = 20 // : 5

x = 20/5

x = 4

x = 4

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