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5x + 3 = 4x+18
5x-4x = 18-3
x = 15
5(15)+3 = 2[2(15)+9]
75 + 3 = 2[30+9]
78 = 60 + 18
78 = 78
5x+3= 4x +18
5x-4x= 18-3
X = 15
Demostración:
Reemplazados (x) por 15
5(15)+3 = 2(2(15)+9)
75 + 3 = 2(30+9)
78. = 60 + 18= es 78
Así que la igualdad se cumple..