7x + 3x − 18 = 6(x + 3)

x = 9

Step-by-step explanation:

7x + 3x - 18 = 6(x + 3)

10x - 18 = 6(x + 3)                  Add like terms

10x - 18 = 6x + 18                   Distribute 6 to x and 3

4x - 18 = 18                             Subtract 6x to both sides

4x = 36                                  Add 18 to both sides

x = 9                                      Divide 4 to both sides

x=9

Step-by-step explanation:

7x+3x-18= 6(x+3)

10x-18= 6x+18

4x= 36

x=9

let m = monomial

let t = trinomial

so, m times t = t.

monomial times a trinomial = another trinomial.