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a in (-oo:+oo)
5*a+2/3 = -58/3 // + -58/3
5*a+2/3-(-58/3) = 0
5*a+2/3+58/3 = 0
5*a+20 = 0 // - 20
5*a = -20 // : 5
a = -20/5
a = -4
a = -4
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