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4\times 2x-240=5\times 3x+320
Multiply both sides of the equation by 20, the least common multiple of 5,4.
8x-240=5\times 3x+320
Multiply 4 and 2 to get 8.
8x-240=15x+320
Multiply 5 and 3 to get 15.
8x-240-15x=320
Subtract 15x from both sides.
-7x-240=320
Combine 8x and -15x to get -7x.
-7x=320+240
Add 240 to both sides.
-7x=560
Add 320 and 240 to get 560.
x=\frac{560}{-7}
Divide both sides by -7.
x=-80
Divide 560 by -7 to get -80.