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20\times 5x-15\left(x-1\right)=12\left(x-3\right)
Multiply both sides of the equation by 60, the least common multiple of 3,4,5.
100x-15\left(x-1\right)=12\left(x-3\right)
Multiply 20 and 5 to get 100.
100x-15x+15=12\left(x-3\right)
Use the distributive property to multiply -15 by x-1.
85x+15=12\left(x-3\right)
Combine 100x and -15x to get 85x.
85x+15=12x-36
Use the distributive property to multiply 12 by x-3.
85x+15-12x=-36
Subtract 12x from both sides.
73x+15=-36
Combine 85x and -12x to get 73x.
73x=-36-15
Subtract 15 from both sides.
73x=-51
Subtract 15 from -36 to get -51.
x=\frac{-51}{73}
Divide both sides by 73.
x=-\frac{51}{73}
Fraction \frac{-51}{73} can be rewritten as -\frac{51}{73} by extracting the negative sign.