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Simplifying -21 + -6x = -3(7 + 2x) -21 + -6x = (7 * -3 + 2x * -3) -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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