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40-2\left(5+2x\right)+28x=48\left(1-\frac{x}{4}\right)
Multiply both sides of the equation by 20, the least common multiple of 10,5,4.
40-10-4x+28x=48\left(1-\frac{x}{4}\right)
Use the distributive property to multiply -2 by 5+2x.
30-4x+28x=48\left(1-\frac{x}{4}\right)
Subtract 10 from 40 to get 30.
30+24x=48\left(1-\frac{x}{4}\right)
Combine -4x and 28x to get 24x.
30+24x=48+48\left(-\frac{x}{4}\right)
Use the distributive property to multiply 48 by 1-\frac{x}{4}.
30+24x=48-12x
Cancel out 4, the greatest common factor in 48 and 4.
30+24x+12x=48
Add 12x to both sides.
30+36x=48
Combine 24x and 12x to get 36x.
36x=48-30
Subtract 30 from both sides.
36x=18
Subtract 30 from 48 to get 18.
x=\frac{18}{36}
Divide both sides by 36.
x=\frac{1}{2}
Reduce the fraction \frac{18}{36} to lowest terms by extracting and canceling out 18.