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a in (-oo:+oo)
-28 = (4/3)*a // - (4/3)*a
-((4/3)*a)-28 = 0
(-4/3)*a-28 = 0
-4/3*a-28 = 0 // + 28
-4/3*a = 28 // : -4/3
a = 28/(-4/3)
a = -21
a = -21
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