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45\left(x-1\right)-9\left(x-5\right)=20\left(x+5\right)
Multiply both sides of the equation by 180, the least common multiple of 4,20,9.
45x-45-9\left(x-5\right)=20\left(x+5\right)
Use the distributive property to multiply 45 by x-1.
45x-45-9x+45=20\left(x+5\right)
Use the distributive property to multiply -9 by x-5.
36x-45+45=20\left(x+5\right)
Combine 45x and -9x to get 36x.
36x=20\left(x+5\right)
Add -45 and 45 to get 0.
36x=20x+100
Use the distributive property to multiply 20 by x+5.
36x-20x=100
Subtract 20x from both sides.
16x=100
Combine 36x and -20x to get 16x.
x=\frac{100}{16}
Divide both sides by 16.
x=\frac{25}{4}
Reduce the fraction \frac{100}{16} to lowest terms by extracting and canceling out 4.