x + 3x = 12
4x = 12
x = 12/4
3 + 3(3) = 12
3 + 9 = 12
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El valor de x es 3
Procedimiento:
x + 3x = 12
4x = 12
x = 12/4
x = 3
Comprobación:
x + 3x = 12
3 + 3(3) = 12
3 + 9 = 12
12 = 12
⭐Atte. Aracelly