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Simplifying 21 + -1r = -87 + 2r Solving 21 + -1r = -87 + 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 + -1r + -2r = -87 + 2r + -2r Combine like terms: -1r + -2r = -3r 21 + -3r = -87 + 2r + -2r Combine like terms: 2r + -2r = 0 21 + -3r = -87 + 0 21 + -3r = -87 Add '-21' to each side of the equation. 21 + -21 + -3r = -87 + -21 Combine like terms: 21 + -21 = 0 0 + -3r = -87 + -21 -3r = -87 + -21 Combine like terms: -87 + -21 = -108 -3r = -108 Divide each side by '-3'. r = 36 Simplifying r = 36
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