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Simplifying -3(7x + -2) + 7 = -21x + 13 Reorder the terms: -3(-2 + 7x) + 7 = -21x + 13 (-2 * -3 + 7x * -3) + 7 = -21x + 13 (6 + -21x) + 7 = -21x + 13 Reorder the terms: 6 + 7 + -21x = -21x + 13 Combine like terms: 6 + 7 = 13 13 + -21x = -21x + 13 Reorder the terms: 13 + -21x = 13 + -21x Add '-13' to each side of the equation. 13 + -13 + -21x = 13 + -13 + -21x Combine like terms: 13 + -13 = 0 0 + -21x = 13 + -13 + -21x -21x = 13 + -13 + -21x Combine like terms: 13 + -13 = 0 -21x = 0 + -21x -21x = -21x Add '21x' to each side of the equation. -21x + 21x = -21x + 21x Combine like terms: -21x + 21x = 0 0 = -21x + 21x Combine like terms: -21x + 21x = 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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