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Simplifying -4(7x + -1) + 9 = -28x + 13 Reorder the terms: -4(-1 + 7x) + 9 = -28x + 13 (-1 * -4 + 7x * -4) + 9 = -28x + 13 (4 + -28x) + 9 = -28x + 13 Reorder the terms: 4 + 9 + -28x = -28x + 13 Combine like terms: 4 + 9 = 13 13 + -28x = -28x + 13 Reorder the terms: 13 + -28x = 13 + -28x Add '-13' to each side of the equation. 13 + -13 + -28x = 13 + -13 + -28x Combine like terms: 13 + -13 = 0 0 + -28x = 13 + -13 + -28x -28x = 13 + -13 + -28x Combine like terms: 13 + -13 = 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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