Ответы на вопрос:
3y - 17 = 4
3y = 4 + 17
3y = 21
y = 21 : 3
y = 7
==========
3y - 17 = 0
3y = 17
y = 17 : 3
y = 5 2/3
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3y - 17 = -8
3y = -8 + 17
3y = 9
y = 9 : 3
y = 3
=============
3y - 17 = 1,5
3y = 1,5 + 17
3y = 18,5
y = 18,5 : 3
y = 6 1/6
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