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