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8x+4=12x-9+2\left(3x+4\right)
Use the distributive property to multiply 3 by 4x-3.
8x+4=12x-9+6x+8
Use the distributive property to multiply 2 by 3x+4.
8x+4=18x-9+8
Combine 12x and 6x to get 18x.
8x+4=18x-1
Add -9 and 8 to get -1.
8x+4-18x=-1
Subtract 18x from both sides.
-10x+4=-1
Combine 8x and -18x to get -10x.
-10x=-1-4
Subtract 4 from both sides.
-10x=-5
Subtract 4 from -1 to get -5.
x=\frac{-5}{-10}
Divide both sides by -10.
x=\frac{1}{2}
Reduce the fraction \frac{-5}{-10} to lowest terms by extracting and canceling out -5.