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a in (-oo:+oo)
7 = (2/3)*a-3 // - (2/3)*a-3
3-((2/3)*a)+7 = 0
(-2/3)*a+3+7 = 0
10-2/3*a = 0 // - 10
-2/3*a = -10 // : -2/3
a = -10/(-2/3)
a = 15
a = 15
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