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Simplifying 43 + -1(-1r) = 15 Remove parenthesis around (-1r) 43 + -1 * -1r = 15 Multiply -1 * -1 43 + 1r = 15 Solving 43 + 1r = 15 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-43' to each side of the equation. 43 + -43 + 1r = 15 + -43 Combine like terms: 43 + -43 = 0 0 + 1r = 15 + -43 1r = 15 + -43 Combine like terms: 15 + -43 = -28 1r = -28 Divide each side by '1'. r = -28 Simplifying r = -28
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