x represents an unknown number.
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It is: (x+1)(x+12) when factored
It is x^2 -13x +12 = (x-1)(x-12) when factored
2x+x+x+9x+2+12 - add the like terms =13x+14 13x and 14 cannot be added because they aren't like terms.
13x = -156 so x = -12
x + 13x + 10x = 50 - 6