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Simplifying 3r + -21 = -18 + 2r Reorder the terms: -21 + 3r = -18 + 2r Solving -21 + 3r = -18 + 2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2r' to each side of the equation. -21 + 3r + -2r = -18 + 2r + -2r Combine like terms: 3r + -2r = 1r -21 + 1r = -18 + 2r + -2r Combine like terms: 2r + -2r = 0 -21 + 1r = -18 + 0 -21 + 1r = -18 Add '21' to each side of the equation. -21 + 21 + 1r = -18 + 21 Combine like terms: -21 + 21 = 0 0 + 1r = -18 + 21 1r = -18 + 21 Combine like terms: -18 + 21 = 3 1r = 3 Divide each side by '1'. r = 3 Simplifying r = 3
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