Respuesta :

faizu
10x-33=3x-12
= 10x - 3x = -12 + 33
= 7x = 21
= x = 21/7 
= x = 3 ..

hope it helps !!!
10x-33=3x-12
+33 +33
10x=3x+21
-3x -3x
7/7x=21/7
X=3