Malinaoalexandreago Malinaoalexandreago Math Answered A. Find the value of the unknown variable.1.3m + 7= 252.X -- 12 = 163.2n -- 5 = 54.the sum of 25 and a number is six times that number. what is the number?5. two times a number minus 5 is equal to the sum of ten and five. what is the number?