помогите решить
305 × 3 - х = 809
10.007 × 2 - х = 10.000
945.783 - 30.009 : х = 945.780

305*3-х=809915-х=809х=915-809х=106305*3-106=809809=80910.007*2-х=10.00020.014-х=10.000х=20.014-10.000х=10.01410.007*2-10.014=10.00010.000=10.000945.783-30.009/х=945.78030.009/х=945.783-945.78030.009/х=0.003х=30.009/0.003х=10003945.783-30.009/10003=945.780945.780=945.780