Question

7(x + 9) + 21(x + 3) = 406​

Answer 1

Answer:

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Answer 2

Answer:

7(x+9)+21(x+3)=406

7x + 63 + 21x + 63 = 406

28x + 126 = 406

28x = 406 - 126

28x = 280

x = 280/28

x =10