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a in (-oo:+oo)
3*a = -12/7 // + -12/7
3*a-(-12/7) = 0
3*a+12/7 = 0
3*a+12/7 = 0 // - 12/7
3*a = -12/7 // : 3
a = -12/7/3
a = -4/7
a = -4/7
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