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Simplifying 10r + (20)(20) = 40 Multiply 20 * 20 10r + 400 = 40 Reorder the terms: 400 + 10r = 40 Solving 400 + 10r = 40 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-400' to each side of the equation. 400 + -400 + 10r = 40 + -400 Combine like terms: 400 + -400 = 0 0 + 10r = 40 + -400 10r = 40 + -400 Combine like terms: 40 + -400 = -360 10r = -360 Divide each side by '10'. r = -36 Simplifying r = -36
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