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Simplifying 3(x + -7) + -1x = 2x + -21 Reorder the terms: 3(-7 + x) + -1x = 2x + -21 (-7 * 3 + x * 3) + -1x = 2x + -21 (-21 + 3x) + -1x = 2x + -21 Combine like terms: 3x + -1x = 2x -21 + 2x = 2x + -21 Reorder the terms: -21 + 2x = -21 + 2x Add '21' to each side of the equation. -21 + 21 + 2x = -21 + 21 + 2x Combine like terms: -21 + 21 = 0 0 + 2x = -21 + 21 + 2x 2x = -21 + 21 + 2x Combine like terms: -21 + 21 = 0 2x = 0 + 2x 2x = 2x Add '-2x' to each side of the equation. 2x + -2x = 2x + -2x Combine like terms: 2x + -2x = 0 0 = 2x + -2x Combine like terms: 2x + -2x = 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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