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Simplifying 2r + -28 = -40 + 4r Reorder the terms: -28 + 2r = -40 + 4r Solving -28 + 2r = -40 + 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. -28 + 2r + -4r = -40 + 4r + -4r Combine like terms: 2r + -4r = -2r -28 + -2r = -40 + 4r + -4r Combine like terms: 4r + -4r = 0 -28 + -2r = -40 + 0 -28 + -2r = -40 Add '28' to each side of the equation. -28 + 28 + -2r = -40 + 28 Combine like terms: -28 + 28 = 0 0 + -2r = -40 + 28 -2r = -40 + 28 Combine like terms: -40 + 28 = -12 -2r = -12 Divide each side by '-2'. r = 6 Simplifying r = 6
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