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-x + 10 + 12x = 44 - 9x + 66
11x + 10 = 110 - 9x
11x + 9x = 110 - 10
20x = 100
x = 100 ÷ 20
x = 5 → Respuesta
COMPROBAMOS:
-x + 10 + 12x = 44 - 9x + 66
-(5) + 10 + 12(5) = 44 - 9(5) + 66
-5 + 10 + 60 = 44 - 45 + 66
65 = 65 → Correcto
RESPUESTA:
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⇒ x = 5
Espero que te ayude.
Saludos!!!