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Simplifying 7(3x + -2) + -4 = 21x + -18 Reorder the terms: 7(-2 + 3x) + -4 = 21x + -18 (-2 * 7 + 3x * 7) + -4 = 21x + -18 (-14 + 21x) + -4 = 21x + -18 Reorder the terms: -14 + -4 + 21x = 21x + -18 Combine like terms: -14 + -4 = -18 -18 + 21x = 21x + -18 Reorder the terms: -18 + 21x = -18 + 21x Add '18' to each side of the equation. -18 + 18 + 21x = -18 + 18 + 21x Combine like terms: -18 + 18 = 0 0 + 21x = -18 + 18 + 21x 21x = -18 + 18 + 21x Combine like terms: -18 + 18 = 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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