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21 + 6x - 6 - 2x = 60x---reducimos términos semejantes
15 + 4x = 60x
4x - 60x = - 15--reducimos términos semejantes
- 56x = - 15---despejamos x
x = -15/-56--aplicas ley de signos---- - por - = +
x = 15/56
Solución :
x = 15/56