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12\left(3x-7\right)+20\left(4x+5\right)=120x-15\left(3x+4\right)
Multiply both sides of the equation by 60, the least common multiple of 5,3,4.
36x-84+20\left(4x+5\right)=120x-15\left(3x+4\right)
Use the distributive property to multiply 12 by 3x-7.
36x-84+80x+100=120x-15\left(3x+4\right)
Use the distributive property to multiply 20 by 4x+5.
116x-84+100=120x-15\left(3x+4\right)
Combine 36x and 80x to get 116x.
116x+16=120x-15\left(3x+4\right)
Add -84 and 100 to get 16.
116x+16=120x-45x-60
Use the distributive property to multiply -15 by 3x+4.
116x+16=75x-60
Combine 120x and -45x to get 75x.
116x+16-75x=-60
Subtract 75x from both sides.
41x+16=-60
Combine 116x and -75x to get 41x.
41x=-60-16
Subtract 16 from both sides.
41x=-76
Subtract 16 from -60 to get -76.
x=\frac{-76}{41}
Divide both sides by 41.
x=-\frac{76}{41}
Fraction \frac{-76}{41} can be rewritten as -\frac{76}{41} by extracting the negative sign.