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5x-4-2x=8
Subtract 2x from both sides.
3x-4=8
Combine 5x and -2x to get 3x.
3x=8+4
Add 4 to both sides.
3x=12
Add 8 and 4 to get 12.
x=\frac{12}{3}
Divide both sides by 3.
x=4
Divide 12 by 3 to get 4.