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Answer :

2(x+9)=142
x+9=71
X=62

Answer: x=10

Step-by-step explanation:

Supplementary angles 142+2(x+9)=180

Subtract 142 frrom both sides

2(x+9)=38

now distribute

2x+18=38

subtract again

2x=20

Divide both sides by 2

x=10

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