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3x+x= 6-2
3(1)+(1)=6-2
4=4
3x + (x + 2) = 6
3x + x + 2 = 6
4x + 2 = 6
4x = 6 - 2
4x = 4
x = 4/4
x = 1
Respuesta.
x = 1