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Simplifying -8r + -4 = 7r + -4 Reorder the terms: -4 + -8r = 7r + -4 Reorder the terms: -4 + -8r = -4 + 7r Add '4' to each side of the equation. -4 + 4 + -8r = -4 + 4 + 7r Combine like terms: -4 + 4 = 0 0 + -8r = -4 + 4 + 7r -8r = -4 + 4 + 7r Combine like terms: -4 + 4 = 0 -8r = 0 + 7r -8r = 7r Solving -8r = 7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7r' to each side of the equation. -8r + -7r = 7r + -7r Combine like terms: -8r + -7r = -15r -15r = 7r + -7r Combine like terms: 7r + -7r = 0 -15r = 0 Divide each side by '-15'. r = 0 Simplifying r = 0
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