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-3x=-24+21
-3x=-3
3x=3
x=3/3
x=1
================
24 = 3(x + 7)
24 = 3x + 21
24 - 21 = 3x
3 = 3x
3 ÷ 3 = x
1 = x ====> Respuesta
Espero que te ayude.
Saludos!!