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Simplifying -4(4x + -9) + 9 = -16x + 45 Reorder the terms: -4(-9 + 4x) + 9 = -16x + 45 (-9 * -4 + 4x * -4) + 9 = -16x + 45 (36 + -16x) + 9 = -16x + 45 Reorder the terms: 36 + 9 + -16x = -16x + 45 Combine like terms: 36 + 9 = 45 45 + -16x = -16x + 45 Reorder the terms: 45 + -16x = 45 + -16x Add '-45' to each side of the equation. 45 + -45 + -16x = 45 + -45 + -16x Combine like terms: 45 + -45 = 0 0 + -16x = 45 + -45 + -16x -16x = 45 + -45 + -16x Combine like terms: 45 + -45 = 0 -16x = 0 + -16x -16x = -16x Add '16x' to each side of the equation. -16x + 16x = -16x + 16x Combine like terms: -16x + 16x = 0 0 = -16x + 16x Combine like terms: -16x + 16x = 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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