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x in (-oo:+oo)
3.2/4 = x/7 // - x/7
3.2/4-(x/7) = 0
0.8-1/7*x = 0 // - 0.8
-1/7*x = -0.8 // : -1/7
x = -0.8/(-1/7)
x = 5.60000011
x = 5.60000011
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