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Grade-4
Solve for the Variable - One-Step Addition and Subtraction Equation
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Solve the equation for variable R
31 - R = 20
Explanation
31 - R = 20
Add R on both sides we get:
31 - R + R = 20 + R
31 = 20 + R
Now, subtract 20 from both sides
31 – 20 = 20 – 20 + R
11 = R
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