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3\left(7x+9\right)-4\left(7-x\right)-24x=12\left(3-x\right)-24\left(\frac{7-x}{3}-\frac{3+x}{4}\right)
Multiply both sides of the equation by 24, the least common multiple of 8,6,2,3,4.
21x+27-4\left(7-x\right)-24x=12\left(3-x\right)-24\left(\frac{7-x}{3}-\frac{3+x}{4}\right)
Use the distributive property to multiply 3 by 7x+9.
21x+27-28+4x-24x=12\left(3-x\right)-24\left(\frac{7-x}{3}-\frac{3+x}{4}\right)
Use the distributive property to multiply -4 by 7-x.
21x-1+4x-24x=12\left(3-x\right)-24\left(\frac{7-x}{3}-\frac{3+x}{4}\right)
Subtract 28 from 27 to get -1.
25x-1-24x=12\left(3-x\right)-24\left(\frac{7-x}{3}-\frac{3+x}{4}\right)
Combine 21x and 4x to get 25x.
x-1=12\left(3-x\right)-24\left(\frac{7-x}{3}-\frac{3+x}{4}\right)
Combine 25x and -24x to get x.
x-1=36-12x-24\left(\frac{7-x}{3}-\frac{3+x}{4}\right)
Use the distributive property to multiply 12 by 3-x.
x-1=36-12x-24\left(\frac{4\left(7-x\right)}{12}-\frac{3\left(3+x\right)}{12}\right)
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 3 and 4 is 12. Multiply \frac{7-x}{3} times \frac{4}{4}. Multiply \frac{3+x}{4} times \frac{3}{3}.
x-1=36-12x-24\times \frac{4\left(7-x\right)-3\left(3+x\right)}{12}
Since \frac{4\left(7-x\right)}{12} and \frac{3\left(3+x\right)}{12} have the same denominator, subtract them by subtracting their numerators.
x-1=36-12x-24\times \frac{28-4x-9-3x}{12}
Do the multiplications in 4\left(7-x\right)-3\left(3+x\right).
x-1=36-12x-24\times \frac{19-7x}{12}
Combine like terms in 28-4x-9-3x.
x-1=36-12x-2\left(19-7x\right)
Cancel out 12, the greatest common factor in 24 and 12.
x-1=36-12x-38+14x
Use the distributive property to multiply -2 by 19-7x.
x-1=-2-12x+14x
Subtract 38 from 36 to get -2.
x-1=-2+2x
Combine -12x and 14x to get 2x.
x-1-2x=-2
Subtract 2x from both sides.
-x-1=-2
Combine x and -2x to get -x.
-x=-2+1
Add 1 to both sides.
-x=-1
Add -2 and 1 to get -1.
x=1
Multiply both sides by -1.