130/13=x/21

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Solution for 130/13=x/21 equation: 


x in (-oo:+oo)

130/13 = x/21 // - x/21

130/13-(x/21) = 0

10-1/21*x = 0 // - 10

-1/21*x = -10 // : -1/21

x = -10/(-1/21)

x = 210

x = 210

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