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a in (-oo:+oo)
3.5/8 = a/3.2 // - a/3.2
3.5/8-(a/3.2) = 0
3.5/8-0.3125*a = 0
0.4375-0.3125*a = 0 // - 0.4375
-0.3125*a = -0.4375 // : -0.3125
a = -0.4375/(-0.3125)
a = 1.4
a = 1.4
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