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Simplifying 18 + 4x = 2(9 + 2x) 18 + 4x = (9 * 2 + 2x * 2) 18 + 4x = (18 + 4x) Add '-18' to each side of the equation. 18 + -18 + 4x = 18 + -18 + 4x Combine like terms: 18 + -18 = 0 0 + 4x = 18 + -18 + 4x 4x = 18 + -18 + 4x Combine like terms: 18 + -18 = 0 4x = 0 + 4x 4x = 4x Add '-4x' to each side of the equation. 4x + -4x = 4x + -4x Combine like terms: 4x + -4x = 0 0 = 4x + -4x Combine like terms: 4x + -4x = 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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