Răspuns:
Explicație pas cu pas:
a +6+b+7+C+8 = 43 <=> a+b+c + 21 = 43 =>
a+b+c = 43-21 => a+b+c = 22 =>
2017+c+b+a = 2017+22 = 2039
5a+5b+29 = 89 => 5a+5b = 89-29 = 60 =>
5(a+b) = 60 => a+b = 60:5 => a+b = 12
15a+136+15b = 15a+15b+136 = 15(a+b) + 136 =
= 15·12 + 136 = 180+136 = 316
