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Simplifying 3r + -2(2r + 1) = 21 Reorder the terms: 3r + -2(1 + 2r) = 21 3r + (1 * -2 + 2r * -2) = 21 3r + (-2 + -4r) = 21 Reorder the terms: -2 + 3r + -4r = 21 Combine like terms: 3r + -4r = -1r -2 + -1r = 21 Solving -2 + -1r = 21 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + -1r = 21 + 2 Combine like terms: -2 + 2 = 0 0 + -1r = 21 + 2 -1r = 21 + 2 Combine like terms: 21 + 2 = 23 -1r = 23 Divide each side by '-1'. r = -23 Simplifying r = -23
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