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Simplifying -1r + 4 = -7 Reorder the terms: 4 + -1r = -7 Solving 4 + -1r = -7 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -1r = -7 + -4 Combine like terms: 4 + -4 = 0 0 + -1r = -7 + -4 -1r = -7 + -4 Combine like terms: -7 + -4 = -11 -1r = -11 Divide each side by '-1'. r = 11 Simplifying r = 11
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