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Simplifying -6x + 3(2x + -7) = -21 Reorder the terms: -6x + 3(-7 + 2x) = -21 -6x + (-7 * 3 + 2x * 3) = -21 -6x + (-21 + 6x) = -21 Reorder the terms: -21 + -6x + 6x = -21 Combine like terms: -6x + 6x = 0 -21 + 0 = -21 -21 = -21 Add '21' to each side of the equation. -21 + 21 = -21 + 21 Combine like terms: -21 + 21 = 0 0 = -21 + 21 Combine like terms: -21 + 21 = 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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