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12x-16+x=6\left(2x+9\right)+18x
Use the distributive property to multiply 2 by 6x-8.
13x-16=6\left(2x+9\right)+18x
Combine 12x and x to get 13x.
13x-16=12x+54+18x
Use the distributive property to multiply 6 by 2x+9.
13x-16=30x+54
Combine 12x and 18x to get 30x.
13x-16-30x=54
Subtract 30x from both sides.
-17x-16=54
Combine 13x and -30x to get -17x.
-17x=54+16
Add 16 to both sides.
-17x=70
Add 54 and 16 to get 70.
x=\frac{70}{-17}
Divide both sides by -17.
x=-\frac{70}{17}
Fraction \frac{70}{-17} can be rewritten as -\frac{70}{17} by extracting the negative sign.