Explicación paso a paso:
2x + x + 4 - ( x + 2 ) = 20
3x + 4 - x - 2 = 20
2x + 2 = 20
2x = 18
x = 9
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Verified answer
Explicación paso a paso:
2x + x + 4 - ( x + 2 ) = 20
3x + 4 - x - 2 = 20
2x + 2 = 20
2x = 18
x = 9