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Simplifying -21 + 3r = -3r + 3(2r + -7) Reorder the terms: -21 + 3r = -3r + 3(-7 + 2r) -21 + 3r = -3r + (-7 * 3 + 2r * 3) -21 + 3r = -3r + (-21 + 6r) Reorder the terms: -21 + 3r = -21 + -3r + 6r Combine like terms: -3r + 6r = 3r -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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