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y=7+3x
y=-x^2+3x+K
7+3x=-x^2+3x+K
-x^2-3x+K-7=0
x^2-3x-k+7=0
K=x^2-3x+7
y=-x^2+3x+K
7+3x=-x^2+3x+x^2-3x+7
3x=0
x=0
y=7+3x
y=7
K=x^2-3x+7
K=7