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