What is the value of ▲ in the equation shown? 7 x 9 = (7 x 10) - (7 x ▲) =_____

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Princess Of Persia · Answer 1 · 2018-11-13T10:28:49+0000

I'm changing the triangle to x to make it easier to look at.
63=70-7x
subtract by 70 to get 7x by itself
-7= -7x
Divide by -7 to both sides to get x
▲=1

What is the value of ▲ in the equation shown? 7 x 9 = (7 x 10) - (7 x ▲) =_____

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