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Simplifying -2(5x + -9) + 3 = -10x + 21 Reorder the terms: -2(-9 + 5x) + 3 = -10x + 21 (-9 * -2 + 5x * -2) + 3 = -10x + 21 (18 + -10x) + 3 = -10x + 21 Reorder the terms: 18 + 3 + -10x = -10x + 21 Combine like terms: 18 + 3 = 21 21 + -10x = -10x + 21 Reorder the terms: 21 + -10x = 21 + -10x Add '-21' to each side of the equation. 21 + -21 + -10x = 21 + -21 + -10x Combine like terms: 21 + -21 = 0 0 + -10x = 21 + -21 + -10x -10x = 21 + -21 + -10x Combine like terms: 21 + -21 = 0 -10x = 0 + -10x -10x = -10x Add '10x' to each side of the equation. -10x + 10x = -10x + 10x Combine like terms: -10x + 10x = 0 0 = -10x + 10x Combine like terms: -10x + 10x = 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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