Answer:
If you mean "z" instead of "x", the answer should be -21.
Explanation:
18 - 3z = 2z - 6z - 3
-3z - 2z + 6z = -18 - 3
z = -21
-21
18-3z = 2z - 6z -3
18-3z = -4z -3
-3z+4z= -3-18
z=-21
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