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Simplifying 9x + -21 = 6 + 9(x + -3) Reorder the terms: -21 + 9x = 6 + 9(x + -3) Reorder the terms: -21 + 9x = 6 + 9(-3 + x) -21 + 9x = 6 + (-3 * 9 + x * 9) -21 + 9x = 6 + (-27 + 9x) Combine like terms: 6 + -27 = -21 -21 + 9x = -21 + 9x Add '21' to each side of the equation. -21 + 21 + 9x = -21 + 21 + 9x Combine like terms: -21 + 21 = 0 0 + 9x = -21 + 21 + 9x 9x = -21 + 21 + 9x Combine like terms: -21 + 21 = 0 9x = 0 + 9x 9x = 9x Add '-9x' to each side of the equation. 9x + -9x = 9x + -9x Combine like terms: 9x + -9x = 0 0 = 9x + -9x Combine like terms: 9x + -9x = 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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