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Simplifying -2(7x + -9) + 3 = -14x + 21 Reorder the terms: -2(-9 + 7x) + 3 = -14x + 21 (-9 * -2 + 7x * -2) + 3 = -14x + 21 (18 + -14x) + 3 = -14x + 21 Reorder the terms: 18 + 3 + -14x = -14x + 21 Combine like terms: 18 + 3 = 21 21 + -14x = -14x + 21 Reorder the terms: 21 + -14x = 21 + -14x Add '-21' to each side of the equation. 21 + -21 + -14x = 21 + -21 + -14x Combine like terms: 21 + -21 = 0 0 + -14x = 21 + -21 + -14x -14x = 21 + -21 + -14x Combine like terms: 21 + -21 = 0 -14x = 0 + -14x -14x = -14x Add '14x' to each side of the equation. -14x + 14x = -14x + 14x Combine like terms: -14x + 14x = 0 0 = -14x + 14x Combine like terms: -14x + 14x = 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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