Respuesta:
20
Explicación paso a paso:
X+2(X+10) = 4X
X+2X+20 = 4X
3X+20 = 4X
20 = 4X-3X
20 = X
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Respuesta:
20
Explicación paso a paso:
X+2(X+10) = 4X
X+2X+20 = 4X
3X+20 = 4X
20 = 4X-3X
20 = X