Question

Помогите плизззз!
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Answer 1

(7,8-3,2х)*5/6=(1,2-4х):8/15
13/2-16/6х=3-15/2х
39/6-16/6х=3-45/6х
39-16х=18-45х
-16х+45х=18-39
29х=-21
х=-21:29
х=-21/29