a)
x + 3 = 2x
x - 2x = - 3
- x = - 3 / : (-1)
x = 3
b)
3x = x + 16 / - x
3x - x = 16
2x = 16 / : 2
x = 8
c) 4x - 20 = 8
4x = 8 + 20
4x = 28 / : 4
x = 7
;)
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a)
x + 3 = 2x
x - 2x = - 3
- x = - 3 / : (-1)
x = 3
b)
3x = x + 16 / - x
3x - x = 16
2x = 16 / : 2
x = 8
c) 4x - 20 = 8
4x = 8 + 20
4x = 28 / : 4
x = 7
;)