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