1)x=2/3x+1 . 2) x-1/2=3/4x . 3) x-2/3=5/6x . 4) 1/4/5 y=y+4 . 5)2/3y-1/3=5/9y . 6)3/4y-2/3=7/12y

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вопрос

1) x = 2/3x + 1
x - 2/3x = 1
1/3x = 1
x = 3

2) x - 1/2 = 3/4x
3/4x - x = 1/2
-1/4x = 1/2
x = -2

3) x - 2/3 = 5/6x
6x - 4 = 5x
x = 4

4) 1/4/5y = y + 4
1/20y = y + 4
-19/20y = 4
y = -80/19

5) 2/3y - 1/3 = 5/9y
6/9y - 1/3 = 5/9y
5/9y = 4/3
y = 8/15

6) 3/4y - 2/3 = 7/12y
9/12y - 8/12 = 7/12y
-1/12y = 8/12
y = -8