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Simplifying -7(4x + -9) + 9 = -28x + 72 Reorder the terms: -7(-9 + 4x) + 9 = -28x + 72 (-9 * -7 + 4x * -7) + 9 = -28x + 72 (63 + -28x) + 9 = -28x + 72 Reorder the terms: 63 + 9 + -28x = -28x + 72 Combine like terms: 63 + 9 = 72 72 + -28x = -28x + 72 Reorder the terms: 72 + -28x = 72 + -28x Add '-72' to each side of the equation. 72 + -72 + -28x = 72 + -72 + -28x Combine like terms: 72 + -72 = 0 0 + -28x = 72 + -72 + -28x -28x = 72 + -72 + -28x Combine like terms: 72 + -72 = 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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