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Simplifying 21 + -3r = -3r + 21 Reorder the terms: 21 + -3r = 21 + -3r Add '-21' to each side of the equation. 21 + -21 + -3r = 21 + -21 + -3r Combine like terms: 21 + -21 = 0 0 + -3r = 21 + -21 + -3r -3r = 21 + -21 + -3r Combine like terms: 21 + -21 = 0 -3r = 0 + -3r -3r = -3r Add '3r' to each side of the equation. -3r + 3r = -3r + 3r Combine like terms: -3r + 3r = 0 0 = -3r + 3r Combine like terms: -3r + 3r = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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