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