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Simplifying -4(3x + -3) + 9 = -12x + 21 Reorder the terms: -4(-3 + 3x) + 9 = -12x + 21 (-3 * -4 + 3x * -4) + 9 = -12x + 21 (12 + -12x) + 9 = -12x + 21 Reorder the terms: 12 + 9 + -12x = -12x + 21 Combine like terms: 12 + 9 = 21 21 + -12x = -12x + 21 Reorder the terms: 21 + -12x = 21 + -12x Add '-21' to each side of the equation. 21 + -21 + -12x = 21 + -21 + -12x Combine like terms: 21 + -21 = 0 0 + -12x = 21 + -21 + -12x -12x = 21 + -21 + -12x Combine like terms: 21 + -21 = 0 -12x = 0 + -12x -12x = -12x Add '12x' to each side of the equation. -12x + 12x = -12x + 12x Combine like terms: -12x + 12x = 0 0 = -12x + 12x Combine like terms: -12x + 12x = 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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