Iron (Fe)
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That is a list of the valences of several elements.Hydrogen is +1 (and also -1, incidentally)Sodium is +1Potassium is +1Calcium is +2
2
5x + 10 = 5(x+2) 6x2 + 12x = 6x(x+2) The only common factor is x+2
When x = -2 then y = 4 which is the common point of intersection of the two equations.
8x+16