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Simplifying 2r + -4 = 2(6 + -72) Reorder the terms: -4 + 2r = 2(6 + -72) Combine like terms: 6 + -72 = -66 -4 + 2r = 2(-66) Multiply 2 * -66 -4 + 2r = -132 Solving -4 + 2r = -132 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + 2r = -132 + 4 Combine like terms: -4 + 4 = 0 0 + 2r = -132 + 4 2r = -132 + 4 Combine like terms: -132 + 4 = -128 2r = -128 Divide each side by '2'. r = -64 Simplifying r = -64
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