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Simplifying 3(7x + -4) + -1 = 21x + -13 Reorder the terms: 3(-4 + 7x) + -1 = 21x + -13 (-4 * 3 + 7x * 3) + -1 = 21x + -13 (-12 + 21x) + -1 = 21x + -13 Reorder the terms: -12 + -1 + 21x = 21x + -13 Combine like terms: -12 + -1 = -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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