<ABD+<DBC=180 because they are supplementary angles.
180-<DCB-<BDC=<DBC because the sum of all the angles in a triangle is 180.
Combine these equations and solve for n:
<ABD+180-<DCB-<BDC=180
4n+6+180-60-2n=180
*Combine like termsI
2n+126=180
*Subtract 126 from both sides*
2n=54
*Divide both sides by 2*
n=27
Plug in 27 for n to calculate <ABD:
4(27)+6
<ABD=114
Hope this helps!!
