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3x+5+2x=20
Add 2x to both sides.
5x+5=20
Combine 3x and 2x to get 5x.
5x=20-5
Subtract 5 from both sides.
5x=15
Subtract 5 from 20 to get 15.
x=\frac{15}{5}
Divide both sides by 5.
x=3
Divide 15 by 5 to get 3.