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a in (-oo:+oo)
5-((2*a)/3) = 7 // - 7
5-((2*a)/3)-7 = 0
(-2/3)*a-7+5 = 0
-2/3*a-2 = 0 // + 2
-2/3*a = 2 // : -2/3
a = 2/(-2/3)
a = -3
a = -3
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