Question

9x-2x=403-256 x=?

5x+4x=866-261-200

163z-157z+627=999 z=

Answer 1

1)9х-2х=403-256
5x=147;
 x=29,4
2)5х+4х=866-261-200
9x=405; 
x=45
3)163z-157z+627=999
163z-157z=999-627
6z=372;
 z=62