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21-7x=2\left(5-x\right)
Use the distributive property to multiply 7 by 3-x.
21-7x=10-2x
Use the distributive property to multiply 2 by 5-x.
21-7x+2x=10
Add 2x to both sides.
21-5x=10
Combine -7x and 2x to get -5x.
-5x=10-21
Subtract 21 from both sides.
-5x=-11
Subtract 21 from 10 to get -11.
x=\frac{-11}{-5}
Divide both sides by -5.
x=\frac{11}{5}
Fraction \frac{-11}{-5} can be simplified to \frac{11}{5} by removing the negative sign from both the numerator and the denominator.