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