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Simplifying -20 + -8r = -6(r + 3) Reorder the terms: -20 + -8r = -6(3 + r) -20 + -8r = (3 * -6 + r * -6) -20 + -8r = (-18 + -6r) Solving -20 + -8r = -18 + -6r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '6r' to each side of the equation. -20 + -8r + 6r = -18 + -6r + 6r Combine like terms: -8r + 6r = -2r -20 + -2r = -18 + -6r + 6r Combine like terms: -6r + 6r = 0 -20 + -2r = -18 + 0 -20 + -2r = -18 Add '20' to each side of the equation. -20 + 20 + -2r = -18 + 20 Combine like terms: -20 + 20 = 0 0 + -2r = -18 + 20 -2r = -18 + 20 Combine like terms: -18 + 20 = 2 -2r = 2 Divide each side by '-2'. r = -1 Simplifying r = -1
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