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3x-42=7x-105
Multiply both sides of the equation by 21, the least common multiple of 7,3.
3x-42-7x=-105
Subtract 7x from both sides.
-4x-42=-105
Combine 3x and -7x to get -4x.
-4x=-105+42
Add 42 to both sides.
-4x=-63
Add -105 and 42 to get -63.
x=\frac{-63}{-4}
Divide both sides by -4.
x=\frac{63}{4}
Fraction \frac{-63}{-4} can be simplified to \frac{63}{4} by removing the negative sign from both the numerator and the denominator.