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9(x-8)+8(x-9)=-212
We move all terms to the left:
9(x-8)+8(x-9)-(-212)=0
We add all the numbers together, and all the variables
9(x-8)+8(x-9)+212=0
We multiply parentheses
9x+8x-72-72+212=0
We add all the numbers together, and all the variables
17x+68=0
We move all terms containing x to the left, all other terms to the right
17x=-68
x=-68/17
x=-4
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