I need help figuring this out, I tried to simplify 3 times

this are fractions, I can't express fractions in here..
-4/7x=12/35
(-7/4) x (-4/7) = -7/4 x 12/35
1 times x = 84/140
I am having trouble simplifying
I got so far 42/70, 21/35 and are wrong
please help

1 answer

I figured it out muself =)
-3/5