7/3a=-21a - solution

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Solution for 7/3a=-21a equation:

a in (-oo:+oo)

(7/3)*a = -21*a // + -21*a

(7/3)*a-(-21*a) = 0

(7/3)*a+21*a = 0

70/3*a = 0 // : 70/3

a = 0

a = 0

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