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2x + 5 = x + 7
2x - x + 5 - 5 = x -x + 7 - 5
x = 2
AD = 2x + 5 = 4 + 5 = 9
yg c klo bingung pake gambar ya!
sudut a sama c itu sama, sudut b sama d sama, jumalh seluruhnya 360, sudut a + sudut b = 180
jadi, < BAD = < A = < C = < BCD = 60 derajat
< ABC = < B = 180 - < A = 180 - 60 = 120 derajat