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a)
x + 3 = 8
x = 8 - 3
x = 5
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b)
5x + 1 = 3x
5x - 3x = 1
2x = 1
x = 1/2
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d)
2x + 3 = 2x - 6
2x - 2x = - 6 + 3
0x = - 3
No hay solución.
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e)
8 + x = 2x
8 = 2x - x
8 = x
..............................................................
g)
2(x + 1) = 4
2x + 2 = 4
2x = 4 - 2
2x = 2
x = 2/2
x = 1