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3\times 7x-120\left(x-9\right)=4\left(20x+1.5\right)
Multiply both sides of the equation by 24, the least common multiple of 8,6.
21x-120\left(x-9\right)=4\left(20x+1.5\right)
Multiply 3 and 7 to get 21.
21x-120x+1080=4\left(20x+1.5\right)
Use the distributive property to multiply -120 by x-9.
-99x+1080=4\left(20x+1.5\right)
Combine 21x and -120x to get -99x.
-99x+1080=80x+6
Use the distributive property to multiply 4 by 20x+1.5.
-99x+1080-80x=6
Subtract 80x from both sides.
-179x+1080=6
Combine -99x and -80x to get -179x.
-179x=6-1080
Subtract 1080 from both sides.
-179x=-1074
Subtract 1080 from 6 to get -1074.
x=\frac{-1074}{-179}
Divide both sides by -179.
x=6
Divide -1074 by -179 to get 6.