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Simplifying 78 = -2r + -7 + -3r Reorder the terms: 78 = -7 + -2r + -3r Combine like terms: -2r + -3r = -5r 78 = -7 + -5r Solving 78 = -7 + -5r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '5r' to each side of the equation. 78 + 5r = -7 + -5r + 5r Combine like terms: -5r + 5r = 0 78 + 5r = -7 + 0 78 + 5r = -7 Add '-78' to each side of the equation. 78 + -78 + 5r = -7 + -78 Combine like terms: 78 + -78 = 0 0 + 5r = -7 + -78 5r = -7 + -78 Combine like terms: -7 + -78 = -85 5r = -85 Divide each side by '5'. r = -17 Simplifying r = -17
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