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a in (-oo:+oo)
7*a-(4*a)-2 = -5/3 // + -5/3
7*a-(4*a)-(-5/3)-2 = 0
7*a-4*a+5/3-2 = 0
3*a-1/3 = 0 // + 1/3
3*a = 1/3 // : 3
a = 1/3/3
a = 1/9
a = 1/9
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