Respuesta :

rama63

Answer:

x =51

Step-by-step explanation:

x-12+x=90°

x+x=90+12

2x=102

2x÷2=102÷2

x=51

then

(x-12°)

51-12

=39°

x°=51

39+51=90°

then x=51

SURE DUDE