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20x-5\left(x+2\right)=120+4\left(x-5\right)
Multiply both sides of the equation by 20, the least common multiple of 4,5.
20x-5x-10=120+4\left(x-5\right)
Use the distributive property to multiply -5 by x+2.
15x-10=120+4\left(x-5\right)
Combine 20x and -5x to get 15x.
15x-10=120+4x-20
Use the distributive property to multiply 4 by x-5.
15x-10=100+4x
Subtract 20 from 120 to get 100.
15x-10-4x=100
Subtract 4x from both sides.
11x-10=100
Combine 15x and -4x to get 11x.
11x=100+10
Add 10 to both sides.
11x=110
Add 100 and 10 to get 110.
x=\frac{110}{11}
Divide both sides by 11.
x=10
Divide 110 by 11 to get 10.