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16x^{2}-54x+18-\left(3+4x\right)\left(4x-7\right)=0
Use the distributive property to multiply 2x-6 by 8x-3 and combine like terms.
16x^{2}-54x+18-\left(-16x-21+16x^{2}\right)=0
Use the distributive property to multiply 3+4x by 4x-7 and combine like terms.
16x^{2}-54x+18+16x+21-16x^{2}=0
To find the opposite of -16x-21+16x^{2}, find the opposite of each term.
16x^{2}-38x+18+21-16x^{2}=0
Combine -54x and 16x to get -38x.
16x^{2}-38x+39-16x^{2}=0
Add 18 and 21 to get 39.
-38x+39=0
Combine 16x^{2} and -16x^{2} to get 0.
-38x=-39
Subtract 39 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-39}{-38}
Divide both sides by -38.
x=\frac{39}{38}
Fraction \frac{-39}{-38} can be simplified to \frac{39}{38} by removing the negative sign from both the numerator and the denominator.