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7x-8-3x=4
Subtract 3x from both sides.
4x-8=4
Combine 7x and -3x to get 4x.
4x=4+8
Add 8 to both sides.
4x=12
Add 4 and 8 to get 12.
x=\frac{12}{4}
Divide both sides by 4.
x=3
Divide 12 by 4 to get 3.