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x-3\left(x-5x+20\right)=10\left(x-3\right)
Use the distributive property to multiply -5 by x-4.
x-3\left(-4x+20\right)=10\left(x-3\right)
Combine x and -5x to get -4x.
x+12x-60=10\left(x-3\right)
Use the distributive property to multiply -3 by -4x+20.
13x-60=10\left(x-3\right)
Combine x and 12x to get 13x.
13x-60=10x-30
Use the distributive property to multiply 10 by x-3.
13x-60-10x=-30
Subtract 10x from both sides.
3x-60=-30
Combine 13x and -10x to get 3x.
3x=-30+60
Add 60 to both sides.
3x=30
Add -30 and 60 to get 30.
x=\frac{30}{3}
Divide both sides by 3.
x=10
Divide 30 by 3 to get 10.