Question

(20+х:70)*80=7200 помогите плиз

Answer 1

(20+x:70)×80=7200

20+x:70=7200:80

20+x:70=90

x:70=90-20

x:70=70

x=70×70

x=4900

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(20+4900:70)×80=7200

7200=7200