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Simplifying -3 = -4r + 7r Combine like terms: -4r + 7r = 3r -3 = 3r Solving -3 = 3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3r' to each side of the equation. -3 + -3r = 3r + -3r Combine like terms: 3r + -3r = 0 -3 + -3r = 0 Add '3' to each side of the equation. -3 + 3 + -3r = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -3r = 0 + 3 -3r = 0 + 3 Combine like terms: 0 + 3 = 3 -3r = 3 Divide each side by '-3'. r = -1 Simplifying r = -1
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