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Simplifying (R) + (r + -8) + (2(r + -8)) = 120 R + (r + -8) + (2(r + -8)) = 120 Reorder the terms: R + (-8 + r) + (2(r + -8)) = 120 Remove parenthesis around (-8 + r) R + -8 + r + (2(r + -8)) = 120 Reorder the terms: R + -8 + r + (2(-8 + r)) = 120 R + -8 + r + ((-8 * 2 + r * 2)) = 120 R + -8 + r + ((-16 + 2r)) = 120 R + -8 + r + (-16 + 2r) = 120 Remove parenthesis around (-16 + 2r) R + -8 + r + -16 + 2r = 120 Reorder the terms: -8 + -16 + R + r + 2r = 120 Combine like terms: -8 + -16 = -24 -24 + R + r + 2r = 120 Combine like terms: r + 2r = 3r -24 + R + 3r = 120 Solving -24 + R + 3r = 120 Solving for variable 'R'. Move all terms containing R to the left, all other terms to the right. Add '24' to each side of the equation. -24 + R + 24 + 3r = 120 + 24 Reorder the terms: -24 + 24 + R + 3r = 120 + 24 Combine like terms: -24 + 24 = 0 0 + R + 3r = 120 + 24 R + 3r = 120 + 24 Combine like terms: 120 + 24 = 144 R + 3r = 144 Add '-3r' to each side of the equation. R + 3r + -3r = 144 + -3r Combine like terms: 3r + -3r = 0 R + 0 = 144 + -3r R = 144 + -3r Simplifying R = 144 + -3r
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