Ответ:
6x-3,5=70
2,5x=70
x=28
6х=3,5(х+20)
6х=3,5х+70
6х-3,5х=70
2,5х=70
х=28
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Ответ:
6x-3,5=70
2,5x=70
x=28
Ответ:
6х=3,5(х+20)
6х=3,5х+70
6х-3,5х=70
2,5х=70
х=28