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3-6x = 9 + 3x
3-9=3x+6x
-6=9X
X= -6/9 → X= -2/3
B) -2 . ( 2x - 6 ) + 3 = 4
-4x +12 + 3 = 4
-4x = 4-12-3
x=-11/-4→ x=11/4
C) -3 . ( x + 2 ) - 1 = 2
-3x-6 - 1= 2
-3x=2+1+6
X= -9/3 → X=-3