-2a=-18

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Solution for -2a=-18 equation: 


a in (-oo:+oo)

-2*a = -18 // + 18

18-2*a = 0

18-2*a = 0 // - 18

-2*a = -18 // : -2

a = -18/(-2)

a = 9

a = 9

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