f=9/5c+32 how do i solve for c

f  =  (9/5)c + 32

Subtract the 32:

f - 32  =  (9/5)c

multiply both sides by 5/9, the reciprocal of 9/5:

(5/9)(f - 32)  =  (5/9)(9/5)c

(5/9)(f - 32)  =  c