Answer:
x=9
Step-by-step explanation: 
the equation
10x-18=6(x+3)
10z-18=6x+18
10x=6x+18+18
10x-6x=36
4x=36 
x=36/4
x=9 
Distributive Property
Subtraction Property of Equality
Combine Like Terms
Multiplication Property of Equality
Division Property of Equality
Addition Property of Equality