Answer:
132/7
Explanation:
180 = 42 + 7x + 6
180 = 7x + 42 +6
180 = 7x + 48
(180 - 48) = 7x (+ 48 - 48)
132 = 7x
7x = 132
7x / 7 = 132 / 7
x = 132/7
83°
m<ABC = 180° because that's a straight line
42 + 5x + 7x + 6 = 180°
12x + 48 = 180
12x = 180 - 48
12x = 132 divide by 12
x = 11
CBE = 7x + 6 ➡ 7×11 + 6 = 83°
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