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1-(3x-9)=5x-4x+2
1-3x+9= x+2
-3x+10=x+2
-3x-x=2+10
-4x=12
x=12/-4
x= - 3
1-3x+9=x+2
-3x+10=x+2
10-2=x+3x
8=4x
x=
x=2
(el 3x y el 9 cambian de signo al estar dentro de un paréntesis con un menos delante)