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2x-3+x=39
Add -8 and 5 to get -3.
3x-3=39
Combine 2x and x to get 3x.
3x=39+3
Add 3 to both sides.
3x=42
Add 39 and 3 to get 42.
x=\frac{42}{3}
Divide both sides by 3.
x=14
Divide 42 by 3 to get 14.