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a in (-oo:+oo)
2/7-a = 7*a-222/7 // - 7*a-222/7
2/7-a-(7*a)-(-222/7) = 0
2/7-a-7*a+222/7 = 0
32-8*a = 0 // - 32
-8*a = -32 // : -8
a = -32/(-8)
a = 4
a = 4
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