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a in (-oo:+oo)
4*a+1/9 = -35/9 // + -35/9
4*a+1/9-(-35/9) = 0
4*a+1/9+35/9 = 0
4*a+4 = 0 // - 4
4*a = -4 // : 4
a = -4/4
a = -1
a = -1
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