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5x-15+4\left(x+5\right)=20
Use the distributive property to multiply 5 by x-3.
5x-15+4x+20=20
Use the distributive property to multiply 4 by x+5.
9x-15+20=20
Combine 5x and 4x to get 9x.
9x+5=20
Add -15 and 20 to get 5.
9x=20-5
Subtract 5 from both sides.
9x=15
Subtract 5 from 20 to get 15.
x=\frac{15}{9}
Divide both sides by 9.
x=\frac{5}{3}
Reduce the fraction \frac{15}{9} to lowest terms by extracting and canceling out 3.