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3x-5-7x=7
Subtract 7x from both sides.
-4x-5=7
Combine 3x and -7x to get -4x.
-4x=7+5
Add 5 to both sides.
-4x=12
Add 7 and 5 to get 12.
x=\frac{12}{-4}
Divide both sides by -4.
x=-3
Divide 12 by -4 to get -3.