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Simplifying -1r + 7 = 55 Reorder the terms: 7 + -1r = 55 Solving 7 + -1r = 55 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -1r = 55 + -7 Combine like terms: 7 + -7 = 0 0 + -1r = 55 + -7 -1r = 55 + -7 Combine like terms: 55 + -7 = 48 -1r = 48 Divide each side by '-1'. r = -48 Simplifying r = -48
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