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x in (-oo:+oo)
0.4*x-(1/2) = 3-0.2 // - 3-0.2
0.4*x-(1/2)-3+0.2 = 0
0.4*x-1/2-3+0.2 = 0
0.4*x-3.3 = 0 // + 3.3
0.4*x = 3.3 // : 0.4
x = 3.3/0.4
x = 8.25
x = 8.25
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