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