x = 4
3x - x + 4 = 5x - 8
2x + 4 = 5x - 8
4 + 8 = 5x - 2x
12 = 3x
12 ÷ 3 = x
4 = x
3(4) - 4 + 4 = 5(4) - 8
12 = 20 - 8
12 = 12
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Respuesta:
x = 4
Explicación paso a paso:
3x - x + 4 = 5x - 8
2x + 4 = 5x - 8
4 + 8 = 5x - 2x
12 = 3x
12 ÷ 3 = x
4 = x
Comprobación:
3(4) - 4 + 4 = 5(4) - 8
12 = 20 - 8
12 = 12