Answer:
20
Step-by-step explanation:
60+x+100=180 is the equation we are asked to solve.
Using commutative property of addition you can rewrite as:
x+60+100=180
Using associative property of addition you can rewrite as:
x+(60+100)=180
Combine like terms/simplify:
x+(160)=180
x+160=180
Use subtraction property of equality to rewrite as:
x+160-160=180-160
Simplify both sides:
x+0=20
Apply the additive identity property:
x=20
So x=20.
Check.
60+x+100=180 with x=20:
60+20+100=180
80+100=180
180=180
The last line I have here is true so x=20 has been verified as the solution.
