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a in (-oo:+oo)
40 = 14*(1/2)*a // - 14*(1/2)*a
40-(14*(1/2)*a) = 0
40-7*a = 0
40-7*a = 0 // - 40
-7*a = -40 // : -7
a = -40/(-7)
a = 40/7
a = 40/7
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