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Simplifying 30 + d = 30 + d Add '-30' to each side of the equation. 30 + -30 + d = 30 + -30 + d Combine like terms: 30 + -30 = 0 0 + d = 30 + -30 + d d = 30 + -30 + d Combine like terms: 30 + -30 = 0 d = 0 + d d = d Add '-1d' to each side of the equation. d + -1d = d + -1d Combine like terms: d + -1d = 0 0 = d + -1d Combine like terms: d + -1d = 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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