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x-12+3x=7x-\left(1-x\right)
Use the distributive property to multiply -3 by 4-x.
4x-12=7x-\left(1-x\right)
Combine x and 3x to get 4x.
4x-12=7x-1-\left(-x\right)
To find the opposite of 1-x, find the opposite of each term.
4x-12=7x-1+x
The opposite of -x is x.
4x-12=8x-1
Combine 7x and x to get 8x.
4x-12-8x=-1
Subtract 8x from both sides.
-4x-12=-1
Combine 4x and -8x to get -4x.
-4x=-1+12
Add 12 to both sides.
-4x=11
Add -1 and 12 to get 11.
x=\frac{11}{-4}
Divide both sides by -4.
x=-\frac{11}{4}
Fraction \frac{11}{-4} can be rewritten as -\frac{11}{4} by extracting the negative sign.