Answer:
d(−3+x)=kx+9
-3d+d+x=kx+9
-2d+x=kx+9
-9 -9
-2d-9+x=kx
/k /k
-2d-9+x=x
/-2 /-2
-9+x=-2+x
+9 +9
x=7+x
-x -x
x=7
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