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2x-12-6x=5-\left(x-4\right)
Use the distributive property to multiply -3 by 4+2x.
-4x-12=5-\left(x-4\right)
Combine 2x and -6x to get -4x.
-4x-12=5-x-\left(-4\right)
To find the opposite of x-4, find the opposite of each term.
-4x-12=5-x+4
The opposite of -4 is 4.
-4x-12=9-x
Add 5 and 4 to get 9.
-4x-12+x=9
Add x to both sides.
-3x-12=9
Combine -4x and x to get -3x.
-3x=9+12
Add 12 to both sides.
-3x=21
Add 9 and 12 to get 21.
x=\frac{21}{-3}
Divide both sides by -3.
x=-7
Divide 21 by -3 to get -7.