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Answer:

7d +d +d=45

Step-by-step explanation:

The length shown for the green line is shown as 45 therefore the black line also has 45

to prove your answer:

7d + d + d = 45

9d = 45

you need to get the letter d on its own so you

9d ÷9 = 45 ÷ 9 (what you do on the one side,you do on the other)

d = 5

*substitute

5 + 7(5) + 5

= 5+ 35 + 5

= 40 +5

= 45

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