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3\times 7x-24\left(5-x\right)=6\left(x-3\right)-20
Multiply both sides of the equation by 12, the least common multiple of 4,2,3.
21x-24\left(5-x\right)=6\left(x-3\right)-20
Multiply 3 and 7 to get 21.
21x-120+24x=6\left(x-3\right)-20
Use the distributive property to multiply -24 by 5-x.
45x-120=6\left(x-3\right)-20
Combine 21x and 24x to get 45x.
45x-120=6x-18-20
Use the distributive property to multiply 6 by x-3.
45x-120=6x-38
Subtract 20 from -18 to get -38.
45x-120-6x=-38
Subtract 6x from both sides.
39x-120=-38
Combine 45x and -6x to get 39x.
39x=-38+120
Add 120 to both sides.
39x=82
Add -38 and 120 to get 82.
x=\frac{82}{39}
Divide both sides by 39.