Explicación paso a paso:
4. (x+18) – 1 = 19
4x + 72 - 1 = 19
4x + 71 = 19
4x = 19 - 71
4x = - 52
x = - 13
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Explicación paso a paso:
4. (x+18) – 1 = 19
4x + 72 - 1 = 19
4x + 71 = 19
4x = 19 - 71
4x = - 52
x = - 13