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Simplifying 3 + 5 + -1(2r + -5) = x Reorder the terms: 3 + 5 + -1(-5 + 2r) = x 3 + 5 + (-5 * -1 + 2r * -1) = x 3 + 5 + (5 + -2r) = x Combine like terms: 3 + 5 = 8 8 + 5 + -2r = x Combine like terms: 8 + 5 = 13 13 + -2r = x Solving 13 + -2r = x Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + -2r = -13 + x Combine like terms: 13 + -13 = 0 0 + -2r = -13 + x -2r = -13 + x Divide each side by '-2'. r = 6.5 + -0.5x Simplifying r = 6.5 + -0.5x
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