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Simplifying (30 + -1y + -1z) + y + z = 30 Remove parenthesis around (30 + -1y + -1z) 30 + -1y + -1z + y + z = 30 Reorder the terms: 30 + -1y + y + -1z + z = 30 Combine like terms: -1y + y = 0 30 + 0 + -1z + z = 30 30 + -1z + z = 30 Combine like terms: -1z + z = 0 30 + 0 = 30 30 = 30 Add '-30' to each side of the equation. 30 + -30 = 30 + -30 Combine like terms: 30 + -30 = 0 0 = 30 + -30 Combine like terms: 30 + -30 = 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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