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Simplifying 45 + 3x + r = 180 Reorder the terms: 45 + r + 3x = 180 Solving 45 + r + 3x = 180 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-45' to each side of the equation. 45 + r + -45 + 3x = 180 + -45 Reorder the terms: 45 + -45 + r + 3x = 180 + -45 Combine like terms: 45 + -45 = 0 0 + r + 3x = 180 + -45 r + 3x = 180 + -45 Combine like terms: 180 + -45 = 135 r + 3x = 135 Add '-3x' to each side of the equation. r + 3x + -3x = 135 + -3x Combine like terms: 3x + -3x = 0 r + 0 = 135 + -3x r = 135 + -3x Simplifying r = 135 + -3x
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