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5-4x-6=4x+7-4x
-4x-4x+4x=7-5+6
-4x=8
x=-8/4
x=-2
Comprobacion:
5-(4(-2)+6)=4(-2)+(7-4(-2))
5-(-8+6)= -8+(7+8)
5+2= -8+15
7=7
Espero que sirva! Saludos!