Question

How to solve 1/x + 1/4 =7/12

Answer 1

1/x + 1/4 = 7/12
1/x = 7/12 - 1/4
1/x = 7/12 - 3/12
1/x = 1/3....multiply both sides by x
1 = 1/3x
1 / (1/3) = x
1 * 3/1 = x
3 = x <====

Answer 2

You need a common denominator for addition/subtraction


`(1)/(x) = (7)/(12) - (1)/(4) ( (3)/(3) ) \\ \\ (1)/(x) = (7)/(12) - (3)/(12) \\ \\ (1)/(x) = (4)/(12) \\ \\ (1)/(x) = (1)/(3) \\ \\ x = 3`