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x in (-oo:+oo)
3*x-(4*x)-(28/15) = 2.6 // - 2.6
3*x-(4*x)-(28/15)-2.6 = 0
3*x-4*x-28/15-2.6 = 0
-x-4.46666667 = 0 // + 4.46666667
-x = 4.46666667 // * -1
x = -4.46666667
x = -4.46666667
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