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Simplifying 2r + -19 = 21 + r Reorder the terms: -19 + 2r = 21 + r Solving -19 + 2r = 21 + 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. -19 + 2r + -1r = 21 + r + -1r Combine like terms: 2r + -1r = 1r -19 + 1r = 21 + r + -1r Combine like terms: r + -1r = 0 -19 + 1r = 21 + 0 -19 + 1r = 21 Add '19' to each side of the equation. -19 + 19 + 1r = 21 + 19 Combine like terms: -19 + 19 = 0 0 + 1r = 21 + 19 1r = 21 + 19 Combine like terms: 21 + 19 = 40 1r = 40 Divide each side by '1'. r = 40 Simplifying r = 40
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