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5x-4\left(3x-7\right)=50-5\left(2x-1\right)
Multiply both sides of the equation by 20, the least common multiple of 4,5,2.
5x-12x+28=50-5\left(2x-1\right)
Use the distributive property to multiply -4 by 3x-7.
-7x+28=50-5\left(2x-1\right)
Combine 5x and -12x to get -7x.
-7x+28=50-10x+5
Use the distributive property to multiply -5 by 2x-1.
-7x+28=55-10x
Add 50 and 5 to get 55.
-7x+28+10x=55
Add 10x to both sides.
3x+28=55
Combine -7x and 10x to get 3x.
3x=55-28
Subtract 28 from both sides.
3x=27
Subtract 28 from 55 to get 27.
x=\frac{27}{3}
Divide both sides by 3.
x=9
Divide 27 by 3 to get 9.