This is an equivalence relation that contains elements of the natural numbers together with an element (denoted by the symbol x) that is defined by some extension of N.
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6x-4+7=-5 6x+3=-5 6x=-8 x=-8/6 = -4/3
It is: 3x2+6x-11 = 0
6x+4=3x+12 => 6x-3x=12-4 => 3x=8 => x=8/3=2.666...
The answer to -6 plus 8 take away 7 plus 3 equals -2. This is taught in math.
Given 6x + (7x-8) = -5 6x + 7x - 8 = -5 ==> 13x = 3 therefore, x = 3/13