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\left(3x+4\right)\left(6x+5\right)-15\left(5x+2\right)=\left(9x+12\right)\left(2x+3\right)+15\left(3x+4\right)\left(-1\right)
Variable x cannot be equal to -\frac{4}{3} since division by zero is not defined. Multiply both sides of the equation by 15\left(3x+4\right), the least common multiple of 15,3x+4,5.
18x^{2}+39x+20-15\left(5x+2\right)=\left(9x+12\right)\left(2x+3\right)+15\left(3x+4\right)\left(-1\right)
Use the distributive property to multiply 3x+4 by 6x+5 and combine like terms.
18x^{2}+39x+20-75x-30=\left(9x+12\right)\left(2x+3\right)+15\left(3x+4\right)\left(-1\right)
Use the distributive property to multiply -15 by 5x+2.
18x^{2}-36x+20-30=\left(9x+12\right)\left(2x+3\right)+15\left(3x+4\right)\left(-1\right)
Combine 39x and -75x to get -36x.
18x^{2}-36x-10=\left(9x+12\right)\left(2x+3\right)+15\left(3x+4\right)\left(-1\right)
Subtract 30 from 20 to get -10.
18x^{2}-36x-10=18x^{2}+51x+36+15\left(3x+4\right)\left(-1\right)
Use the distributive property to multiply 9x+12 by 2x+3 and combine like terms.
18x^{2}-36x-10=18x^{2}+51x+36-15\left(3x+4\right)
Multiply 15 and -1 to get -15.
18x^{2}-36x-10=18x^{2}+51x+36-45x-60
Use the distributive property to multiply -15 by 3x+4.
18x^{2}-36x-10=18x^{2}+6x+36-60
Combine 51x and -45x to get 6x.
18x^{2}-36x-10=18x^{2}+6x-24
Subtract 60 from 36 to get -24.
18x^{2}-36x-10-18x^{2}=6x-24
Subtract 18x^{2} from both sides.
-36x-10=6x-24
Combine 18x^{2} and -18x^{2} to get 0.
-36x-10-6x=-24
Subtract 6x from both sides.
-42x-10=-24
Combine -36x and -6x to get -42x.
-42x=-24+10
Add 10 to both sides.
-42x=-14
Add -24 and 10 to get -14.
x=\frac{-14}{-42}
Divide both sides by -42.
x=\frac{1}{3}
Reduce the fraction \frac{-14}{-42} to lowest terms by extracting and canceling out -14.