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Simplifying 1 + -1r = 3r + r + 1 Reorder the terms: 1 + -1r = 1 + 3r + r Combine like terms: 3r + r = 4r 1 + -1r = 1 + 4r Add '-1' to each side of the equation. 1 + -1 + -1r = 1 + -1 + 4r Combine like terms: 1 + -1 = 0 0 + -1r = 1 + -1 + 4r -1r = 1 + -1 + 4r Combine like terms: 1 + -1 = 0 -1r = 0 + 4r -1r = 4r Solving -1r = 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. -1r + -4r = 4r + -4r Combine like terms: -1r + -4r = -5r -5r = 4r + -4r Combine like terms: 4r + -4r = 0 -5r = 0 Divide each side by '-5'. r = 0 Simplifying r = 0
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