20-13=x/3 - solution

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Solution for 20-13=x/3 equation:

x in (-oo:+oo)

20-13 = x/3 // - x/3

20-(x/3)-13 = 0

7-1/3*x = 0 // - 7

-1/3*x = -7 // : -1/3

x = -7/(-1/3)

x = 21

x = 21

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