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x in (-oo:+oo)
-x/6.9 = -0.3 // + 0.3
0.3-x/6.9 = 0
0.3-0.14492754*x = 0 // - 0.3
-0.14492754*x = -0.3 // : -0.14492754
x = -0.3/(-0.14492754)
x = 2.06999995
x = 2.06999995
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