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Simplifying -1r + 3 + -7 = 15 Reorder the terms: 3 + -7 + -1r = 15 Combine like terms: 3 + -7 = -4 -4 + -1r = 15 Solving -4 + -1r = 15 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 = 15 + 4 Combine like terms: -4 + 4 = 0 0 + -1r = 15 + 4 -1r = 15 + 4 Combine like terms: 15 + 4 = 19 -1r = 19 Divide each side by '-1'. r = -19 Simplifying r = -19
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