Răspuns :
a + b + c = 243 ( 12 ·c +7) + ( 5·c + 2) + c = 243
a = 12·c + 7
b = 5 · c + 2 18 ·c = 243 - 7 - 2
18 · c = 234 ; c= 234 :18 = 13
a = 12 · 13 + 7 = 156 +7=163
b = 5 · 13 + 2 = 65 + 2 = 67
a = 12·c + 7
b = 5 · c + 2 18 ·c = 243 - 7 - 2
18 · c = 234 ; c= 234 :18 = 13
a = 12 · 13 + 7 = 156 +7=163
b = 5 · 13 + 2 = 65 + 2 = 67
a+b+c=243
a:c=12 r 7
a=12c+7
b:c=5 r 2
b=5c+2
12c+7+5c+2+c=243
18c+9=243
18c=243-9
18c=234/18
c=13
a=12*13+7
a=163
b=5*13+2
b=67
Verificare
a+b+c=243
163+67+13=243
a:c=12 r 7
a=12c+7
b:c=5 r 2
b=5c+2
12c+7+5c+2+c=243
18c+9=243
18c=243-9
18c=234/18
c=13
a=12*13+7
a=163
b=5*13+2
b=67
Verificare
a+b+c=243
163+67+13=243