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4x+7 + 7x+8 = 180
=> 11x + 15 = 180
=> 11x = 180 - 15
=> x = 165/11
x = 15
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Answer:
Value of x = 15°
4x+7+7x+8=180. (Because the sum of co-interior angles is 180.)
11x+15=180
11x=180-15=165
x=165/11=15
there the value of x is 15°
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