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Simplifying -18 = r + -4 + 6r Reorder the terms: -18 = -4 + r + 6r Combine like terms: r + 6r = 7r -18 = -4 + 7r Solving -18 = -4 + 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. -18 + -7r = -4 + 7r + -7r Combine like terms: 7r + -7r = 0 -18 + -7r = -4 + 0 -18 + -7r = -4 Add '18' to each side of the equation. -18 + 18 + -7r = -4 + 18 Combine like terms: -18 + 18 = 0 0 + -7r = -4 + 18 -7r = -4 + 18 Combine like terms: -4 + 18 = 14 -7r = 14 Divide each side by '-7'. r = -2 Simplifying r = -2
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