помогите решить, 486:(5x+2)=18 и 5(14+b)+6b=158

5х + 2 = 486 : 18
5х = 27 - 2
5х = 25
  х = 5
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70 + 5b + 6b = 158
11b = 158 - 70
11b = 88
   b = 11