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Simplifying -7 = 5 + -4r + 7r Combine like terms: -4r + 7r = 3r -7 = 5 + 3r Solving -7 = 5 + 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. -7 + -3r = 5 + 3r + -3r Combine like terms: 3r + -3r = 0 -7 + -3r = 5 + 0 -7 + -3r = 5 Add '7' to each side of the equation. -7 + 7 + -3r = 5 + 7 Combine like terms: -7 + 7 = 0 0 + -3r = 5 + 7 -3r = 5 + 7 Combine like terms: 5 + 7 = 12 -3r = 12 Divide each side by '-3'. r = -4 Simplifying r = -4
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