2x+4=4x-20

2x+4=4x-20

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can someone help me solve for maximum y-value. The equation is f(x)-x^2+6x+3

2x+4 =4x -20
-2x -2x
4=2x-20
+20 +20
24=2x
/2 /2
x= 12

how come it's not -12?

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