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x in (-oo:+oo)
3 = x/2.6 // - x/2.6
3-(x/2.6) = 0
3-0.38461538*x = 0
3-0.38461538*x = 0 // - 3
-0.38461538*x = -3 // : -0.38461538
x = -3/(-0.38461538)
x = 7.80000009
x = 7.80000009
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