Find the value of X help

here (180-5x+4)+(180-4x+9)+(180-9x-6)+(180-4x+1)+(180-7x+4)= 520

= 900-29x+12=520

=29x= 900+12-520

= 29x= 380+12

=29x= 392

=x= 392/29

hope it helps

1) c 2143.6 cm

2) c 113.0 m

3) a 33.5 ft

4)   d 2 cm

5) c 20 mm

6) 180 in

7) d 120 ft

a) 0.25x times 3. (could be wrong on equation.)

b) 2.25 pound of dark chocolate. (can i eat all the chocolate? plz? anyway, again, could be wrong, but i hope im right. all the chocolate together should be 5.25 pounds)

have a good day!