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Simplifying 7x + 18 = 4x + 3x + -9 + 27 Reorder the terms: 18 + 7x = 4x + 3x + -9 + 27 Reorder the terms: 18 + 7x = -9 + 27 + 4x + 3x Combine like terms: -9 + 27 = 18 18 + 7x = 18 + 4x + 3x Combine like terms: 4x + 3x = 7x 18 + 7x = 18 + 7x Add '-18' to each side of the equation. 18 + -18 + 7x = 18 + -18 + 7x Combine like terms: 18 + -18 = 0 0 + 7x = 18 + -18 + 7x 7x = 18 + -18 + 7x Combine like terms: 18 + -18 = 0 7x = 0 + 7x 7x = 7x Add '-7x' to each side of the equation. 7x + -7x = 7x + -7x Combine like terms: 7x + -7x = 0 0 = 7x + -7x Combine like terms: 7x + -7x = 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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