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