Реши уравнения.800-×=254+142.d-254=352-121.×-180=250+45.a+235=900-124.100+а=920-540.с+70=67+80.

1.800-х=254-142800-х=112-х=112-800х=6882.d-254=352-121d-254=231d=231+254d=4853.а+235=900-124а+235=776а=776-235а=5414.100+а=920-540100+а=380а=380-100а=2805. с+70=67+80с+70=147с=147-70с=77