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-2x+8+6x=7x+21
4x+8=7x+21
-3x=13
x=-13/3
para comprobar remplazamos el valor de x
(-(-13/3)+4+3(-13/3))/7=(-13/3+3)/2
(13/3+4-39/3)/7=(-4/3)/2
(-14/3)/7=(-4/3)/2
-14/21=-4/6
-2/3=-2/3
comprobado