The left and right sides of the equation are multiplied by the least common multiple of the denominator respectively.

For example, (2x+ 1)/3=(3x-5)/4 and then 4(2x+ 1)=3(3x-5).

(2x+1)/3-(3x-5)/4 =1then 4 (2x+1)-3 (3x-5) =12.