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a in (-oo:+oo)
(1/9)*(a+2) = (1/8)*(7-a) // - (1/8)*(7-a)
(1/9)*(a+2)-((1/8)*(7-a)) = 0
(1/9)*(a+2)+(-1/8)*(7-a) = 0
1/9*(a+2)-1/8*(7-a) = 0
1/9*(a+2)-1/8*(7-a) = 0
17/72*a-47/72 = 0
17/72*a-47/72 = 0
17/72*a-47/72 = 0 // + 47/72
17/72*a = 47/72 // : 17/72
a = 47/72/17/72
a = 47/17
a = 47/17
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