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a in (-oo:+oo)
(-9/14)*a = -1/2 // + -1/2
(-9/14)*a-(-1/2) = 0
(-9/14)*a+1/2 = 0
1/2-9/14*a = 0 // - 1/2
-9/14*a = -1/2 // : -9/14
a = -1/2/(-9/14)
a = 7/9
a = 7/9
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