Answer:
-9
Explanation:
−2x+1/2 y =18
-2x + 1/2 (0) = 18
-2x + 0 = 18
-2x = 18
then divide -2x by 18
then u get -9
set y to 0
-2x + 1/2y = 18
-2x +1/2(0)=18
-2x / -2 = 18 /-2
x = -9
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