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4x-40=5\times 5\left(x-3\right)
Multiply both sides of the equation by 20, the least common multiple of 5,4.
4x-40=25\left(x-3\right)
Multiply 5 and 5 to get 25.
4x-40=25x-75
Use the distributive property to multiply 25 by x-3.
4x-40-25x=-75
Subtract 25x from both sides.
-21x-40=-75
Combine 4x and -25x to get -21x.
-21x=-75+40
Add 40 to both sides.
-21x=-35
Add -75 and 40 to get -35.
x=\frac{-35}{-21}
Divide both sides by -21.
x=\frac{5}{3}
Reduce the fraction \frac{-35}{-21} to lowest terms by extracting and canceling out -7.