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x + 5 = 10 + 3
x + 5 = 13
x = 13 - 5
x = 8
Comprobamos: (Reemplazamos la x)
8 + 5 - 3 =
13 - 3 =
10
2) x - 3 . 2 + 5 = 5
x - 6 + 5 = 5
x - 6 = 5 - 5
x - 6 = 0
x = 0 + 6
x = 6
Comprobamos:
6 - 3 . 2 + 5 =
6 - 6 + 5 =
0 + 5 =
5
3) x + 10 + 10 = 30 - 1x
x + 10 + 10 + 1x = 30
x + 10 + 1x = 30 - 10
x + 10 + 1x = 20
x + 1x = 20 - 10
x + 1x = 10
2x = 10
x = 10 : 2
x = 5
Comprobamos:
5 + 10 + 10 = 30 - 5
15 + 10 = 25
25 = 25