Ответ:

  1. \((x-34)+15=61\)

    \(x-19=61\)

    \(x=61+19=80\)

  2. \((x-36)-43=72\)

    \(x-79=72\)

    \(x=72+79=151\)

  3. \((37+d)-58=49\)

    \(d-21=49\)

    \(d=49+21=70\)

  4. \(957-(t+336)=428\)

    \(t+336=957-428=529\)

    \(t=529-336=193\)

  5. \(325-(a-617)=219\)

    \(a-617=325-219=106\)

    \(a=106+617=723\)

  6. \(468-(259-c)=382\)

    \(259-c=468-382=86\)

    \(c=259-86=173\)

Ответ: 1) \(x=80\); 2) \(x=151\); 3) \(d=70\); 4) \(t=193\); 5) \(a=723\); 6) \(c=173\).