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3 years ago

9

Please help me with this

2 answers:

masha68 [24]3 years ago

7 0

Answer:

12

Step-by-step explanation:

10x-11+3x-2+3x+1=180

16x-12=180

16x=192

x=12

Luba_88 [7]3 years ago

5 0

Answer:

12

Step-by-step explanation:

The sum of three angles is 180°

(3x + 1) + (3x-2) + (10x -11) = 180°

16x -12 = 180

16x = 192

x = 12

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