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45\left(7-9x\right)-40\times 3=72\left(2x-7\right)
Multiply both sides of the equation by 360, the least common multiple of 8,9,5.
315-405x-40\times 3=72\left(2x-7\right)
Use the distributive property to multiply 45 by 7-9x.
315-405x-120=72\left(2x-7\right)
Multiply -40 and 3 to get -120.
195-405x=72\left(2x-7\right)
Subtract 120 from 315 to get 195.
195-405x=144x-504
Use the distributive property to multiply 72 by 2x-7.
195-405x-144x=-504
Subtract 144x from both sides.
195-549x=-504
Combine -405x and -144x to get -549x.
-549x=-504-195
Subtract 195 from both sides.
-549x=-699
Subtract 195 from -504 to get -699.
x=\frac{-699}{-549}
Divide both sides by -549.
x=\frac{233}{183}
Reduce the fraction \frac{-699}{-549} to lowest terms by extracting and canceling out -3.