37х-21х+8=200, 9х+8х=136 и 38х-25х+18=200

Question

37х-21х+8=200, 9х+8х=136 и 38х-25х+18=200

Answer 1

А)37х-21х+8=200
16х+8=200
16х=200-8
16х=192
х=192:16
х=12
б)9х+8х=136
17х=136
х=136:17
х=8
в)38х-25х+18=200
13х+18=200
13х=200-18
13х=182
х=182:13
х=14

Answer 2

16х=192;х=12. 17х=136;х=8. 13х=182;х=14