"g(x)=h(x) \\to x+1=9-x\\to x=4."
"g(x)=f(x)\\to x+1=1\\to x=0."
"h(x)=f(x)\\to 9-x=1\\to x=8."
"A=\\int_0^4(g(x)-1)dx+\\int_4^8(h(x)-1)dx=\\int_0^4xdx+\\int_4^8(8-x)dx=\\\\\n=\\frac{x^2}{2}|_{x=0}^{x=4}+(8x-\\frac{x^2}{2})|_{x=4}^{x=8}=8."
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