Question

Solve: 15? − 21 = 20? − 11​

Answer 1

Answer:

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Step-by-step explanation:

15x-21=20x-11

taking x to one side and numbers to another side

15x-20x=-11+21

-5x=10

x= -2

if we substitute x = -2

15(-2)-21=20(-2)-11

-30-21=-40-11

-51= -51