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-3\left(x-6\right)-\left(4-x\right)-12=2\left(2x+1\right)+6x
Multiply both sides of the equation by 6, the least common multiple of 2,6,3.
-3x+18-\left(4-x\right)-12=2\left(2x+1\right)+6x
Use the distributive property to multiply -3 by x-6.
-3x+18-4-\left(-x\right)-12=2\left(2x+1\right)+6x
To find the opposite of 4-x, find the opposite of each term.
-3x+18-4+x-12=2\left(2x+1\right)+6x
The opposite of -x is x.
-3x+14+x-12=2\left(2x+1\right)+6x
Subtract 4 from 18 to get 14.
-2x+14-12=2\left(2x+1\right)+6x
Combine -3x and x to get -2x.
-2x+2=2\left(2x+1\right)+6x
Subtract 12 from 14 to get 2.
-2x+2=4x+2+6x
Use the distributive property to multiply 2 by 2x+1.
-2x+2=10x+2
Combine 4x and 6x to get 10x.
-2x+2-10x=2
Subtract 10x from both sides.
-12x+2=2
Combine -2x and -10x to get -12x.
-12x=2-2
Subtract 2 from both sides.
-12x=0
Subtract 2 from 2 to get 0.
x=0
Product of two numbers is equal to 0 if at least one of them is 0. Since -12 is not equal to 0, x must be equal to 0.