That's an invalid equation.
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solution with [OH-] = 2.5 x 10-9 , A solution with [H+] = 1.2 x 10-4, A solution with pH = 4.5
4x+9=25 4x=16 x=4
y= -9
6333
Since 'x' appears only to the 1st power, this is a linear equation,and there's only one solution.4x + 9 = 25Subtract 9 from each side:4x = 16Divide each side by 4:x = 4