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7x-3-4x=15
Subtract 4x from both sides.
3x-3=15
Combine 7x and -4x to get 3x.
3x=15+3
Add 3 to both sides.
3x=18
Add 15 and 3 to get 18.
x=\frac{18}{3}
Divide both sides by 3.
x=6
Divide 18 by 3 to get 6.