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Simplifying 9w + -21 = 3(w + -7) + 6w Reorder the terms: -21 + 9w = 3(w + -7) + 6w Reorder the terms: -21 + 9w = 3(-7 + w) + 6w -21 + 9w = (-7 * 3 + w * 3) + 6w -21 + 9w = (-21 + 3w) + 6w Combine like terms: 3w + 6w = 9w -21 + 9w = -21 + 9w Add '21' to each side of the equation. -21 + 21 + 9w = -21 + 21 + 9w Combine like terms: -21 + 21 = 0 0 + 9w = -21 + 21 + 9w 9w = -21 + 21 + 9w Combine like terms: -21 + 21 = 0 9w = 0 + 9w 9w = 9w Add '-9w' to each side of the equation. 9w + -9w = 9w + -9w Combine like terms: 9w + -9w = 0 0 = 9w + -9w Combine like terms: 9w + -9w = 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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