To re-write using the distributive property, you need to find the greatest common factor (GCF) of 6f and 12fy. The factors are:
Factors of 6f = 1, 2, 3, 6, f
Factors of 12fy = 1, 2, 3, 4, 6, 12, f, y
The GCF of 6f and 12fy is 6f:
6f + 12fy = 6f + 6f*2y = 6f(1+2y)