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7-28=5x+2x
-21=7x|:3
-7=x
x=8-3x
x+3x=8
4x=8|:4
x=2
7 -2x = 5x + 28
-2x - 5x = 28 - 7
-7x = 21 /:(-7)
x = -3
b)
x = 8 -3x
x + 3x = 8
4x = 8 /:4
x = 2
-2x - 5x = 28 - 7
- 7 x = 21 / -7
x = -3
x=8-3x
x + 3x = 8
4 x = 8 /4
x = 2