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Simplifying 4r + -11 = 4r + 21 Reorder the terms: -11 + 4r = 4r + 21 Reorder the terms: -11 + 4r = 21 + 4r Add '-4r' to each side of the equation. -11 + 4r + -4r = 21 + 4r + -4r Combine like terms: 4r + -4r = 0 -11 + 0 = 21 + 4r + -4r -11 = 21 + 4r + -4r Combine like terms: 4r + -4r = 0 -11 = 21 + 0 -11 = 21 Solving -11 = 21 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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