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35-21=7x(x-x)
We move all terms to the left:
35-21-(7x(x-x))=0
We add all the numbers together, and all the variables
-(7x0)+35-21=0
We add all the numbers together, and all the variables
-7x+14=0
We move all terms containing x to the left, all other terms to the right
-7x=-14
x=-14/-7
x=+2
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