n=43. 2n=86 is the same as saying 2 of what is 86? or 2 x n = 86? (replace "of" with x and "is" with =) REad it like an equation. so, 2x43=86 and n=43
The GCF of 86 and 154 is 2. 86=2x43 154 = 2x7x11 Now the GCF is 2 since 43 does not occur in the prime factorization of 154 and 7 and 11 do not appear in the prime factorization of 86.
(3276,1)(1638,2)(1092,3)(819,4)(546,6)(468,7)(364,9)(273,12)(252,13)(234,14)(182,18)(156,21)(126,26)(117,28)(91,36)(84,39)(78,42)(63,52)