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8X =141-21
8X = 120
X =120/8
X=15
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8x + 21 = 141
8x = 141 - 21
8x = 120
x = 121 ÷ 8
x = 15 → Respuesta
COMPROBAMOS:
8x + 21 = 141
8(15) + 21 = 141
120 + 21 = 141
141 = 141 → Correcto
RESPUESTA:
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x = 15
Espero que te ayude.
Saludos!!!