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9x-2(x-7)=28
We move all terms to the left:
9x-2(x-7)-(28)=0
We multiply parentheses
9x-2x+14-28=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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