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a in (-oo:+oo)
(-6/7)*a = -18/7 // + -18/7
(-6/7)*a-(-18/7) = 0
(-6/7)*a+18/7 = 0
18/7-6/7*a = 0 // - 18/7
-6/7*a = -18/7 // : -6/7
a = -18/7/(-6/7)
a = 3
a = 3
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