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Simplifying 4x + 5 + -4(x + -1) = 9 Reorder the terms: 4x + 5 + -4(-1 + x) = 9 4x + 5 + (-1 * -4 + x * -4) = 9 4x + 5 + (4 + -4x) = 9 Reorder the terms: 5 + 4 + 4x + -4x = 9 Combine like terms: 5 + 4 = 9 9 + 4x + -4x = 9 Combine like terms: 4x + -4x = 0 9 + 0 = 9 9 = 9 Add '-9' to each side of the equation. 9 + -9 = 9 + -9 Combine like terms: 9 + -9 = 0 0 = 9 + -9 Combine like terms: 9 + -9 = 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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