Answer:
= 5
Explanation:
1. Add 8 to both sides of the equation
2 . Simplify
3 . Subtract 4 from both sides of the equation
4 . Simplify ( combine like terms )
5 . Divide both sides of the equation by the same term
6 . Simplify
R = 5
Isolate the variable by dividing each side by factors that don't contain the variable.
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