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15\times 5x-20\times 4x=12\times 2x
Multiply both sides of the equation by 60, the least common multiple of 4,3,5.
75x-20\times 4x=12\times 2x
Multiply 15 and 5 to get 75.
75x-80x=12\times 2x
Multiply -20 and 4 to get -80.
-5x=12\times 2x
Combine 75x and -80x to get -5x.
-5x=24x
Multiply 12 and 2 to get 24.
-5x-24x=0
Subtract 24x from both sides.
-29x=0
Combine -5x and -24x to get -29x.
x=0
Product of two numbers is equal to 0 if at least one of them is 0. Since -29 is not equal to 0, x must be equal to 0.