gthif13211
09.12.2020 •
Mathematics
The secret number is grater than 75.
it has 9 tens.
it has a 3 in the ones places.
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Ответ:
15x + 15 = 8x + 20
7x = 5
x = 5/7
-2(x - 3) + 4x = -(-x + 1)
-2x + 6 + 4x = x - 1
x = -7