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Simplifying 2(3r + -6) + -1(2r + 1) = -13 Reorder the terms: 2(-6 + 3r) + -1(2r + 1) = -13 (-6 * 2 + 3r * 2) + -1(2r + 1) = -13 (-12 + 6r) + -1(2r + 1) = -13 Reorder the terms: -12 + 6r + -1(1 + 2r) = -13 -12 + 6r + (1 * -1 + 2r * -1) = -13 -12 + 6r + (-1 + -2r) = -13 Reorder the terms: -12 + -1 + 6r + -2r = -13 Combine like terms: -12 + -1 = -13 -13 + 6r + -2r = -13 Combine like terms: 6r + -2r = 4r -13 + 4r = -13 Add '13' to each side of the equation. -13 + 13 + 4r = -13 + 13 Combine like terms: -13 + 13 = 0 0 + 4r = -13 + 13 4r = -13 + 13 Combine like terms: -13 + 13 = 0 4r = 0 Solving 4r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Divide each side by '4'. r = 0 Simplifying r = 0
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