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3\left(5x-8\right)-4\left(2x-7\right)=39
Multiply both sides of the equation by 12, the least common multiple of 4,3.
15x-24-4\left(2x-7\right)=39
Use the distributive property to multiply 3 by 5x-8.
15x-24-8x+28=39
Use the distributive property to multiply -4 by 2x-7.
7x-24+28=39
Combine 15x and -8x to get 7x.
7x+4=39
Add -24 and 28 to get 4.
7x=39-4
Subtract 4 from both sides.
7x=35
Subtract 4 from 39 to get 35.
x=\frac{35}{7}
Divide both sides by 7.
x=5
Divide 35 by 7 to get 5.