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7x + 4 + 8x + 6x - 8 = 180
21x + 4 = 180 + 8
21x = 188 - 4
= 184
x = 184/21
= 8,76°
<ABE = 7x + 4
= 7 . 8,76 + 4
= 61,32 + 4
= ±65 = 67° ( C )
atau mungkin itu salah soal , bila <CBD = 6x + 8 jadi :
x = 8
<ABE = 7 . 8 + 4
= 56 + 4
= 60° ( D )
kamu bisa tnyakan kejelasan soalnya pada gurumu ...