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Simplifying 4 = r + 13x Solving 4 = r + 13x 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. 4 + -1r = r + -1r + 13x Combine like terms: r + -1r = 0 4 + -1r = 0 + 13x 4 + -1r = 13x Add '-4' to each side of the equation. 4 + -4 + -1r = -4 + 13x Combine like terms: 4 + -4 = 0 0 + -1r = -4 + 13x -1r = -4 + 13x Divide each side by '-1'. r = 4 + -13x Simplifying r = 4 + -13x
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