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3x+72=4x-4\left(4\times 3+2\right)
Multiply both sides of the equation by 12, the least common multiple of 4,3.
3x+72=4x-4\left(12+2\right)
Multiply 4 and 3 to get 12.
3x+72=4x-4\times 14
Add 12 and 2 to get 14.
3x+72=4x-56
Multiply -4 and 14 to get -56.
3x+72-4x=-56
Subtract 4x from both sides.
-x+72=-56
Combine 3x and -4x to get -x.
-x=-56-72
Subtract 72 from both sides.
-x=-128
Subtract 72 from -56 to get -128.
x=128
Multiply both sides by -1.