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18x-42=6x-6
Use the distributive property to multiply 6 by 3x-7.
18x-42-6x=-6
Subtract 6x from both sides.
12x-42=-6
Combine 18x and -6x to get 12x.
12x=-6+42
Add 42 to both sides.
12x=36
Add -6 and 42 to get 36.
x=\frac{36}{12}
Divide both sides by 12.
x=3
Divide 36 by 12 to get 3.