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3\left(x+3\right)-4\left(x-1\right)=42
Multiply both sides of the equation by 12, the least common multiple of 4,3,2.
3x+9-4\left(x-1\right)=42
Use the distributive property to multiply 3 by x+3.
3x+9-4x+4=42
Use the distributive property to multiply -4 by x-1.
-x+9+4=42
Combine 3x and -4x to get -x.
-x+13=42
Add 9 and 4 to get 13.
-x=42-13
Subtract 13 from both sides.
-x=29
Subtract 13 from 42 to get 29.
x=-29
Multiply both sides by -1.