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Failed to parse (syntax error): {\displaystyle INFRAROADRAI_{r,t}=100*e^{-3.558+1.328*ln(\frac{GDPPC_{r,t}*1000}}{LANDAREA_{r,t}})+0.239*ln(INFRAROAD_{r,t}*\frac{LANDAREA_{r,t}*1000}{POP_{r,t}})}