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Simplifying 5x + -2(x + -2) = 7x + 4 + -4x Reorder the terms: 5x + -2(-2 + x) = 7x + 4 + -4x 5x + (-2 * -2 + x * -2) = 7x + 4 + -4x 5x + (4 + -2x) = 7x + 4 + -4x Reorder the terms: 4 + 5x + -2x = 7x + 4 + -4x Combine like terms: 5x + -2x = 3x 4 + 3x = 7x + 4 + -4x Reorder the terms: 4 + 3x = 4 + 7x + -4x Combine like terms: 7x + -4x = 3x 4 + 3x = 4 + 3x Add '-4' to each side of the equation. 4 + -4 + 3x = 4 + -4 + 3x Combine like terms: 4 + -4 = 0 0 + 3x = 4 + -4 + 3x 3x = 4 + -4 + 3x Combine like terms: 4 + -4 = 0 3x = 0 + 3x 3x = 3x Add '-3x' to each side of the equation. 3x + -3x = 3x + -3x Combine like terms: 3x + -3x = 0 0 = 3x + -3x Combine like terms: 3x + -3x = 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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