Is a major environmental issue in the philippines, korea, indonesia, and myanmar.

I believe it is Deforestation

So  if  the sum of the enthalpies of the reactants is greater than the products, the  reaction  will be  exothermic.  if  the products side has a larger enthalpy, the  reaction  is  endothermic. you may wonder why  endothermic reactions, which soak up energy or enthalpy from the environment, even happen

343^x = 49^4-xx = 4-xx+x=42x = 4x = 4/2x = 2therefore x = 2