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a in (-oo:+oo)
7*a+2/3 = -22/9 // + -22/9
7*a+2/3-(-22/9) = 0
7*a+2/3+22/9 = 0
7*a+28/9 = 0 // - 28/9
7*a = -28/9 // : 7
a = -28/9/7
a = -4/9
a = -4/9
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