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Simplifying 8 = r + -7 Reorder the terms: 8 = -7 + r Solving 8 = -7 + r 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. 8 + -1r = -7 + r + -1r Combine like terms: r + -1r = 0 8 + -1r = -7 + 0 8 + -1r = -7 Add '-8' to each side of the equation. 8 + -8 + -1r = -7 + -8 Combine like terms: 8 + -8 = 0 0 + -1r = -7 + -8 -1r = -7 + -8 Combine like terms: -7 + -8 = -15 -1r = -15 Divide each side by '-1'. r = 15 Simplifying r = 15
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