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Simplifying 20 + -5r = 20 + -5r Add '-20' to each side of the equation. 20 + -20 + -5r = 20 + -20 + -5r Combine like terms: 20 + -20 = 0 0 + -5r = 20 + -20 + -5r -5r = 20 + -20 + -5r Combine like terms: 20 + -20 = 0 -5r = 0 + -5r -5r = -5r Add '5r' to each side of the equation. -5r + 5r = -5r + 5r Combine like terms: -5r + 5r = 0 0 = -5r + 5r Combine like terms: -5r + 5r = 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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