4(2x-10)=5(2x-20)
8х-40=10х-100
8х-10х=40-100
-2х=-60
Х=-60:(-2)
Х=30
Я так думаю
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4(2x-10)=5(2x-20)
8х-40=10х-100
8х-10х=40-100
-2х=-60
Х=-60:(-2)
Х=30
Я так думаю