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