which equation is true when the value of x is-12?

a.
[tex] \frac{1}{2} x + 22 = 20[/tex]
b.
[tex]15 - \frac{1}{2} x = 21[/tex]
c.
[tex]11 - 2x = 17[/tex]
d.
[tex]3x - 19 = - 17[/tex]
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