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4x + 12 + x = (9x + 27)/2
5x + 12 = (9x + 27)/2
2 (5x + 12) = 9x + 27
10x + 24 = 9x + 27
10x - 9x = 27 - 24
x = 3
Solución :
x = 3
VERIFICAMOS
4 (x + 3) + x = 9 (x + 3)/2
4 (3 + 3) + 3 = 9 (3 + 3)/2
4 (6) + 3 = 9 (6)/2
24 + 3 = 54/2
27 = 27
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