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x in (-oo:+oo)
x/2.6+6.9+6.9 = 0
0.38461538*x+13.8 = 0 // - 13.8
0.38461538*x = -13.8 // : 0.38461538
x = -13.8/0.38461538
x = -35.88000043
x = -35.88000043
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