Ответ:
258+2x-80=700
260x-80=700
260x=700+80
260x=780
x=3
50x+40x=540
90x=540
x=6
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Ответ:
258+2x-80=700
260x-80=700
260x=700+80
260x=780
x=3
50x+40x=540
90x=540
x=6