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Simplifying R + (R + -12) = 90 Reorder the terms: R + (-12 + R) = 90 Remove parenthesis around (-12 + R) R + -12 + R = 90 Reorder the terms: -12 + R + R = 90 Combine like terms: R + R = 2R -12 + 2R = 90 Solving -12 + 2R = 90 Solving for variable 'R'. Move all terms containing R to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 2R = 90 + 12 Combine like terms: -12 + 12 = 0 0 + 2R = 90 + 12 2R = 90 + 12 Combine like terms: 90 + 12 = 102 2R = 102 Divide each side by '2'. R = 51 Simplifying R = 51
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