If the sum of twice a number and -10 is multiplied by -4, the result is 61 greater than the opposite of the number. what is the number?

A33 gram sample of a substance that's used to detect explosives has a k-value of 0.1473. n = noekt no = initial mass (at time t = 0) n = mass at time t k = a positive constant that depends on the substance itself and on the units used to measure time t = time, in days