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Simplifying 7r + -18 = -30 + r Reorder the terms: -18 + 7r = -30 + r Solving -18 + 7r = -30 + 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. -18 + 7r + -1r = -30 + r + -1r Combine like terms: 7r + -1r = 6r -18 + 6r = -30 + r + -1r Combine like terms: r + -1r = 0 -18 + 6r = -30 + 0 -18 + 6r = -30 Add '18' to each side of the equation. -18 + 18 + 6r = -30 + 18 Combine like terms: -18 + 18 = 0 0 + 6r = -30 + 18 6r = -30 + 18 Combine like terms: -30 + 18 = -12 6r = -12 Divide each side by '6'. r = -2 Simplifying r = -2
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