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5x - 20 = 90
5x = 90 +20
5x = 110
x = 110/5
x = 22
∠CBD = 3x - 25
= 3(22) - 25
= 66 - 25
= 41 (C)
20) a + b + c = 360
130 + x + 125 = 360
255 + x = 360
x = 360 - 255
x = 105
5x-20=90
5x=90+20
5x=110
x=22
ABD(2x+5)=49°
CB(3x-25)=41°
semoga bermanfaat^-^