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a in (-oo:+oo)
(-1/3)*a = -7/3 // + -7/3
(-1/3)*a-(-7/3) = 0
(-1/3)*a+7/3 = 0
7/3-1/3*a = 0 // - 7/3
-1/3*a = -7/3 // : -1/3
a = -7/3/(-1/3)
a = 7
a = 7
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