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30\left(5x+7\right)-15\left(3x+5\right)=24\left(4x+9\right)-40\left(x-9\right)
Multiply both sides of the equation by 120, the least common multiple of 4,8,5,3.
150x+210-15\left(3x+5\right)=24\left(4x+9\right)-40\left(x-9\right)
Use the distributive property to multiply 30 by 5x+7.
150x+210-45x-75=24\left(4x+9\right)-40\left(x-9\right)
Use the distributive property to multiply -15 by 3x+5.
105x+210-75=24\left(4x+9\right)-40\left(x-9\right)
Combine 150x and -45x to get 105x.
105x+135=24\left(4x+9\right)-40\left(x-9\right)
Subtract 75 from 210 to get 135.
105x+135=96x+216-40\left(x-9\right)
Use the distributive property to multiply 24 by 4x+9.
105x+135=96x+216-40x+360
Use the distributive property to multiply -40 by x-9.
105x+135=56x+216+360
Combine 96x and -40x to get 56x.
105x+135=56x+576
Add 216 and 360 to get 576.
105x+135-56x=576
Subtract 56x from both sides.
49x+135=576
Combine 105x and -56x to get 49x.
49x=576-135
Subtract 135 from both sides.
49x=441
Subtract 135 from 576 to get 441.
x=\frac{441}{49}
Divide both sides by 49.
x=9
Divide 441 by 49 to get 9.