900-х=254+142 a+325=124 150+a+1000-540d-254=452-121 c+90=76+80x-180

900-х=254+142                    a+325=124
                                             150+a+1000-540
d-254=452-121                     c+90=76+80
x-180=250+50

  • 900-х=254+142
    900-х=396
    х=900-396
    х=504
    d-254=452-121    
    d-254=331
    d =331+254
    d=585
    x-180=250+50
    х-180=300
    х=300+180
    х=480
    a-325=124
    а=124+325
    а=449
     150+a+1000-540=610+а
    c+90=76+80
    с+90=156
    с=156-90
    с=66