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Simplifying 30 = 18 + x + (12 + -1x) Remove parenthesis around (12 + -1x) 30 = 18 + x + 12 + -1x Reorder the terms: 30 = 18 + 12 + x + -1x Combine like terms: 18 + 12 = 30 30 = 30 + x + -1x Combine like terms: x + -1x = 0 30 = 30 + 0 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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