Решите уравнения: а) (1600+t) : 80 = 60                     б) 1600:80 +t = 60
    2000:f - 670 = 1330                       (2000-600) :f = 70
    1300 - (d-678) = 400                      d - (1300-678) = 400

Помогите очень надо
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