9x/6x-30 + 3x/4x-20 Reduce the first term

= 6x/4x-20 + 3x/4x-20 Multiply the first term by 2/2 (Identity theorem) to create a LCM

= 9x/4x-20 Add like terms

= 6x/4x-20 + 3x/4x-20 Multiply the first term by 2/2 (Identity theorem) to create a LCM

= 9x/4x-20 Add like terms