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a in (-oo:+oo)
10-((4/3)*a) = 3 // - 3
10-((4/3)*a)-3 = 0
(-4/3)*a-3+10 = 0
7-4/3*a = 0 // - 7
-4/3*a = -7 // : -4/3
a = -7/(-4/3)
a = 21/4
a = 21/4
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