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a in (-oo:+oo)
(-2*a)/3 = 7 // - 7
(-2*a)/3-7 = 0
-2/3*a-7 = 0 // + 7
-2/3*a = 7 // : -2/3
a = 7/(-2/3)
a = -21/2
a = -21/2
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