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a in (-oo:+oo)
7*a-3 = -13/2 // + -13/2
7*a-(-13/2)-3 = 0
7*a+13/2-3 = 0
7*a+7/2 = 0 // - 7/2
7*a = -7/2 // : 7
a = -7/2/7
a = -1/2
a = -1/2
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