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a in (-oo:+oo)
2*a+2/3 = -4/5 // + -4/5
2*a+2/3-(-4/5) = 0
2*a+2/3+4/5 = 0
2*a+22/15 = 0 // - 22/15
2*a = -22/15 // : 2
a = -22/15/2
a = -11/15
a = -11/15
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