Răspuns :
a - b = 158
a = 18b + 5
18b + 5 - b = 158
17b = 158 - 5
17b = 153
b = 9
a = 18*9 + 5
a = 162 + 5
a = 167
a=18b+5
a=b+158
a=18b+5
diferenta e de 17 b deci:
18b+5=
1b+158
17b=158-5=153
b=153:17
b=9
a=9.18+5
a=162+5
a=167
verificare:167:9=18 rest 5
a=b+158
a=18b+5
diferenta e de 17 b deci:
18b+5=
1b+158
17b=158-5=153
b=153:17
b=9
a=9.18+5
a=162+5
a=167
verificare:167:9=18 rest 5