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Simplifying 7r + -15 = -7 + 8r Reorder the terms: -15 + 7r = -7 + 8r Solving -15 + 7r = -7 + 8r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8r' to each side of the equation. -15 + 7r + -8r = -7 + 8r + -8r Combine like terms: 7r + -8r = -1r -15 + -1r = -7 + 8r + -8r Combine like terms: 8r + -8r = 0 -15 + -1r = -7 + 0 -15 + -1r = -7 Add '15' to each side of the equation. -15 + 15 + -1r = -7 + 15 Combine like terms: -15 + 15 = 0 0 + -1r = -7 + 15 -1r = -7 + 15 Combine like terms: -7 + 15 = 8 -1r = 8 Divide each side by '-1'. r = -8 Simplifying r = -8
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