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Simplifying -5r + 5r = 4r + -3r + -7 Combine like terms: -5r + 5r = 0 0 = 4r + -3r + -7 Reorder the terms: 0 = -7 + 4r + -3r Combine like terms: 4r + -3r = 1r 0 = -7 + 1r Solving 0 = -7 + 1r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. 0 + -1r = -7 + 1r + -1r Remove the zero: -1r = -7 + 1r + -1r Combine like terms: 1r + -1r = 0 -1r = -7 + 0 -1r = -7 Divide each side by '-1'. r = 7 Simplifying r = 7
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