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Simplifying 21 + -6r = -6(r + -3) Reorder the terms: 21 + -6r = -6(-3 + r) 21 + -6r = (-3 * -6 + r * -6) 21 + -6r = (18 + -6r) Add '6r' to each side of the equation. 21 + -6r + 6r = 18 + -6r + 6r Combine like terms: -6r + 6r = 0 21 + 0 = 18 + -6r + 6r 21 = 18 + -6r + 6r Combine like terms: -6r + 6r = 0 21 = 18 + 0 21 = 18 Solving 21 = 18 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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