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84\left(x-8\right)-21\left(2x-4\right)=3\left(\left(2x-3\right)\times 4+9\right)-7x
Multiply both sides of the equation by 21, the least common multiple of 7,3.
84x-672-21\left(2x-4\right)=3\left(\left(2x-3\right)\times 4+9\right)-7x
Use the distributive property to multiply 84 by x-8.
84x-672-42x+84=3\left(\left(2x-3\right)\times 4+9\right)-7x
Use the distributive property to multiply -21 by 2x-4.
42x-672+84=3\left(\left(2x-3\right)\times 4+9\right)-7x
Combine 84x and -42x to get 42x.
42x-588=3\left(\left(2x-3\right)\times 4+9\right)-7x
Add -672 and 84 to get -588.
42x-588=3\left(8x-12+9\right)-7x
Use the distributive property to multiply 2x-3 by 4.
42x-588=3\left(8x-3\right)-7x
Add -12 and 9 to get -3.
42x-588=24x-9-7x
Use the distributive property to multiply 3 by 8x-3.
42x-588=17x-9
Combine 24x and -7x to get 17x.
42x-588-17x=-9
Subtract 17x from both sides.
25x-588=-9
Combine 42x and -17x to get 25x.
25x=-9+588
Add 588 to both sides.
25x=579
Add -9 and 588 to get 579.
x=\frac{579}{25}
Divide both sides by 25.