Respuesta :

Answer:

x=5

Step-by-step explanation:

2x+x= 3x

3x=15

15/3=5

Answer:

x=15 and x=7

Step-by-step explanation:

2x^2+x=15

x(2x+1)=15

x=15

2x+1=15

2x=15-1

x=14/2

x=7

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