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Por que soy mas flexible cada año que pasa y sin hacer estiramientos? 7^(x+1) + 7^x + 7^(x-1) = 399, what is x? How many 2 cubic ft. bags of mulch to fill a space that is 30 ft. x 16 ft. x 3 in's deep? Is there a musical term for two independent, non-complementary, parts being played simultaneously? What about for three parts? When the pressure that a gas exerts on a sealed container changes from -atm to 1.80 atm, the temperature changes from 86.0 C to 30.0 C.?