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24 = 2x + 6x
24 = 8x
x = 24/8
x = 3
2°: 3x - 10 = 18 - x
3x + x = 18 + 10
4x = 28
x = 28/4
x = 7
3°: x + 3 • (x - 1) - 7 = 6
x + 3x - 3 - 7 = 6
x + 3x = 6 + 3 + 7
4x = 16
x = 16/4
x = 4