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Simplifying 4r + -21 = -33 + r Reorder the terms: -21 + 4r = -33 + r Solving -21 + 4r = -33 + 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. -21 + 4r + -1r = -33 + r + -1r Combine like terms: 4r + -1r = 3r -21 + 3r = -33 + r + -1r Combine like terms: r + -1r = 0 -21 + 3r = -33 + 0 -21 + 3r = -33 Add '21' to each side of the equation. -21 + 21 + 3r = -33 + 21 Combine like terms: -21 + 21 = 0 0 + 3r = -33 + 21 3r = -33 + 21 Combine like terms: -33 + 21 = -12 3r = -12 Divide each side by '3'. r = -4 Simplifying r = -4
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