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