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20\left(x-2\right)-12\left(x-4\right)=15\left(x-3\right)
Multiply both sides of the equation by 60, the least common multiple of 3,5,4.
20x-40-12\left(x-4\right)=15\left(x-3\right)
Use the distributive property to multiply 20 by x-2.
20x-40-12x+48=15\left(x-3\right)
Use the distributive property to multiply -12 by x-4.
8x-40+48=15\left(x-3\right)
Combine 20x and -12x to get 8x.
8x+8=15\left(x-3\right)
Add -40 and 48 to get 8.
8x+8=15x-45
Use the distributive property to multiply 15 by x-3.
8x+8-15x=-45
Subtract 15x from both sides.
-7x+8=-45
Combine 8x and -15x to get -7x.
-7x=-45-8
Subtract 8 from both sides.
-7x=-53
Subtract 8 from -45 to get -53.
x=\frac{-53}{-7}
Divide both sides by -7.
x=\frac{53}{7}
Fraction \frac{-53}{-7} can be simplified to \frac{53}{7} by removing the negative sign from both the numerator and the denominator.