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eason Abstractly Write an addition equation that has the solution x=9. 

          eason Abstractly Write an addition equation that has the solution x=9.

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Computer Science and Information Technology
Computer Science and Information Technology
Trishna Knowledge Systems 2018 Edition
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eason Abstractly Write an addition equation that has the solution x=9.
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Transcript

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00:01 Okay, when you are solving an equation like this, your goals get the variable by itself.
00:05 So you've got to get rid of this minus 9.
00:07 You can apply what's called the addition principle, which says that you can add the same value to both sides of an equation, and you'll still get an equivalent equation with the same solution.
00:16 So how would you get rid of this minus 9 to isolate the variable? you've got to cancel out minus 9 by adding a positive 9, right? so if you added a positive 9, i'll just make that simple.
00:26 And just put plus 9...
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