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Simplifying -20 + -6r = -4(r + 1) Reorder the terms: -20 + -6r = -4(1 + r) -20 + -6r = (1 * -4 + r * -4) -20 + -6r = (-4 + -4r) Solving -20 + -6r = -4 + -4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4r' to each side of the equation. -20 + -6r + 4r = -4 + -4r + 4r Combine like terms: -6r + 4r = -2r -20 + -2r = -4 + -4r + 4r Combine like terms: -4r + 4r = 0 -20 + -2r = -4 + 0 -20 + -2r = -4 Add '20' to each side of the equation. -20 + 20 + -2r = -4 + 20 Combine like terms: -20 + 20 = 0 0 + -2r = -4 + 20 -2r = -4 + 20 Combine like terms: -4 + 20 = 16 -2r = 16 Divide each side by '-2'. r = -8 Simplifying r = -8
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