4x +2x = 21- 3
6x = 21 - 3
x= 18
x = 18/6
x = 3
comprobación
4 ( 3 ) + 2 ( 3 ) = 18
21 - 3 = 18
18=18
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4x + 2x = 21 - 3
6x = 18
x = 18/6
x = 3
Respuesta: x=3
Comprobación :
4x + 2x = 21 - 3
12 + 6 = 18
Verified answer
4x +2x = 21- 3
6x = 21 - 3
x= 18
x = 18/6
x = 3
comprobación
4 ( 3 ) + 2 ( 3 ) = 18
21 - 3 = 18
18=18
x = 3