Ответ:
(72*100-52*10)-(5х+90)=23*100+42*10
(7200-520)-5x-90=2300+420
6590-5x=2720
-5x=2700-6590
-5x=-3870
x=(-5):(-3870)
x=774
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Ответ:
(72*100-52*10)-(5х+90)=23*100+42*10
(7200-520)-5x-90=2300+420
6590-5x=2720
-5x=2700-6590
-5x=-3870
x=(-5):(-3870)
x=774