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Simplifying -3(5x + 7) = -15x + -21 Reorder the terms: -3(7 + 5x) = -15x + -21 (7 * -3 + 5x * -3) = -15x + -21 (-21 + -15x) = -15x + -21 Reorder the terms: -21 + -15x = -21 + -15x Add '21' to each side of the equation. -21 + 21 + -15x = -21 + 21 + -15x Combine like terms: -21 + 21 = 0 0 + -15x = -21 + 21 + -15x -15x = -21 + 21 + -15x Combine like terms: -21 + 21 = 0 -15x = 0 + -15x -15x = -15x Add '15x' to each side of the equation. -15x + 15x = -15x + 15x Combine like terms: -15x + 15x = 0 0 = -15x + 15x Combine like terms: -15x + 15x = 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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