Cumulative Practice
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Gather all of the variable terms on one side of the equation and all of the constant terms on the other side.
I
To solve an equation, we should first gather all of the variable terms on one side and all of the constant terms on the other side using the Properties of Equality. In this case, we need to start by using the Distributive Property to simplify the left-hand side of the equation.
Now, we can continue to solve using the Properties of Equality. Remember, only like terms can be combined.
LHS+20=RHS+20
Add terms
LHS-3x=RHS-3x
Subtract term
.LHS /2.=.RHS /2.
Calculate quotient
The solution to the equation is x=10. Therefore, the correct option is I.