a/21=-10/7

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Solution for a/21=-10/7 equation: 


a in (-oo:+oo)

a/21 = -10/7 // + -10/7

a/21-(-10/7) = 0

a/21+10/7 = 0

1/21*a+10/7 = 0 // - 10/7

1/21*a = -10/7 // : 1/21

a = -10/7/1/21

a = -30

a = -30

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