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Simplifying R + -1(1 + -2) + (r + -5) = 13 Combine like terms: 1 + -2 = -1 R + -1(-1) + (r + -5) = 13 Multiply -1 * -1 R + 1 + (r + -5) = 13 Reorder the terms: R + 1 + (-5 + r) = 13 Remove parenthesis around (-5 + r) R + 1 + -5 + r = 13 Reorder the terms: 1 + -5 + R + r = 13 Combine like terms: 1 + -5 = -4 -4 + R + r = 13 Solving -4 + R + r = 13 Solving for variable 'R'. Move all terms containing R to the left, all other terms to the right. Add '4' to each side of the equation. -4 + R + 4 + r = 13 + 4 Reorder the terms: -4 + 4 + R + r = 13 + 4 Combine like terms: -4 + 4 = 0 0 + R + r = 13 + 4 R + r = 13 + 4 Combine like terms: 13 + 4 = 17 R + r = 17 Add '-1r' to each side of the equation. R + r + -1r = 17 + -1r Combine like terms: r + -1r = 0 R + 0 = 17 + -1r R = 17 + -1r Simplifying R = 17 + -1r
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