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Simplifying -4 + 15r = -7 + 15r + 3 Reorder the terms: -4 + 15r = -7 + 3 + 15r Combine like terms: -7 + 3 = -4 -4 + 15r = -4 + 15r Add '4' to each side of the equation. -4 + 4 + 15r = -4 + 4 + 15r Combine like terms: -4 + 4 = 0 0 + 15r = -4 + 4 + 15r 15r = -4 + 4 + 15r Combine like terms: -4 + 4 = 0 15r = 0 + 15r 15r = 15r Add '-15r' to each side of the equation. 15r + -15r = 15r + -15r Combine like terms: 15r + -15r = 0 0 = 15r + -15r Combine like terms: 15r + -15r = 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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