Question

1) (х+3.8)-5.04=7.8
2) (Х-9.3)+13.86+20.7

Answer 1

(х+3,8)-5,04=7,8
х+3,8=7,8+5,04
х+3,8=12,84
х=12,84-3,8
х=9,04

(х-9,3)+13,86=20.7
х-9,3=20,7-13,86
х-9,3=6,84
х=6,84+9,3
х=16,14