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Simplifying 18x + 20 = 2(7x + 9) + 4x + 2 Reorder the terms: 20 + 18x = 2(7x + 9) + 4x + 2 Reorder the terms: 20 + 18x = 2(9 + 7x) + 4x + 2 20 + 18x = (9 * 2 + 7x * 2) + 4x + 2 20 + 18x = (18 + 14x) + 4x + 2 Reorder the terms: 20 + 18x = 18 + 2 + 14x + 4x Combine like terms: 18 + 2 = 20 20 + 18x = 20 + 14x + 4x Combine like terms: 14x + 4x = 18x 20 + 18x = 20 + 18x Add '-20' to each side of the equation. 20 + -20 + 18x = 20 + -20 + 18x Combine like terms: 20 + -20 = 0 0 + 18x = 20 + -20 + 18x 18x = 20 + -20 + 18x Combine like terms: 20 + -20 = 0 18x = 0 + 18x 18x = 18x Add '-18x' to each side of the equation. 18x + -18x = 18x + -18x Combine like terms: 18x + -18x = 0 0 = 18x + -18x Combine like terms: 18x + -18x = 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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