a) 3x - 2 = 13
x = (13 + 2)/3
x = 15/3
x = 5
b) 7x = 6 + 5x
(7 - 5)x = 6
2x = 6
x = 6/2
x = 3
c) 3x + 7 = 21 - x
(3 - 1)x = (21 + 7)
2x = 28
x = 28/2
x = 14
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a) 3x - 2 = 13
x = (13 + 2)/3
x = 15/3
x = 5
b) 7x = 6 + 5x
(7 - 5)x = 6
2x = 6
x = 6/2
x = 3
c) 3x + 7 = 21 - x
(3 - 1)x = (21 + 7)
2x = 28
x = 28/2
x = 14