-25
.
= ( 17/35 - 4/7 + 4/5 ) x ( - 35 )
= (- 17/35 + 4/7 -4/5 ) x 35
= - 17x35 / 35 + 35 x 4/7 -35 x 4/5
= - 17 + 20 - 28
= -25