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Simplifying -4(7x + -3) + 9 = -28x + 21 Reorder the terms: -4(-3 + 7x) + 9 = -28x + 21 (-3 * -4 + 7x * -4) + 9 = -28x + 21 (12 + -28x) + 9 = -28x + 21 Reorder the terms: 12 + 9 + -28x = -28x + 21 Combine like terms: 12 + 9 = 21 21 + -28x = -28x + 21 Reorder the terms: 21 + -28x = 21 + -28x Add '-21' to each side of the equation. 21 + -21 + -28x = 21 + -21 + -28x Combine like terms: 21 + -21 = 0 0 + -28x = 21 + -21 + -28x -28x = 21 + -21 + -28x Combine like terms: 21 + -21 = 0 -28x = 0 + -28x -28x = -28x Add '28x' to each side of the equation. -28x + 28x = -28x + 28x Combine like terms: -28x + 28x = 0 0 = -28x + 28x Combine like terms: -28x + 28x = 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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