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Simplifying 18 + 18 + r + r = r + x Combine like terms: 18 + 18 = 36 36 + r + r = r + x Combine like terms: r + r = 2r 36 + 2r = r + x Solving 36 + 2r = r + x Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. 36 + 2r + -1r = r + -1r + x Combine like terms: 2r + -1r = 1r 36 + 1r = r + -1r + x Combine like terms: r + -1r = 0 36 + 1r = 0 + x 36 + 1r = x Add '-36' to each side of the equation. 36 + -36 + 1r = -36 + x Combine like terms: 36 + -36 = 0 0 + 1r = -36 + x 1r = -36 + x Divide each side by '1'. r = -36 + x Simplifying r = -36 + x
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