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x in (-oo:+oo)
-x/6.4 = -0.3 // + 0.3
0.3-x/6.4 = 0
0.3-0.15625*x = 0 // - 0.3
-0.15625*x = -0.3 // : -0.15625
x = -0.3/(-0.15625)
x = 1.92
x = 1.92
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