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x in (-oo:+oo)
1.8/5 = x/4 // - x/4
1.8/5-(x/4) = 0
0.36-1/4*x = 0 // - 0.36
-1/4*x = -0.36 // : -1/4
x = -0.36/(-1/4)
x = 1.44
x = 1.44
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