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Simplifying 21 + -11x + 18x = 3(4x + 7) + -5x Combine like terms: -11x + 18x = 7x 21 + 7x = 3(4x + 7) + -5x Reorder the terms: 21 + 7x = 3(7 + 4x) + -5x 21 + 7x = (7 * 3 + 4x * 3) + -5x 21 + 7x = (21 + 12x) + -5x Combine like terms: 12x + -5x = 7x 21 + 7x = 21 + 7x Add '-21' to each side of the equation. 21 + -21 + 7x = 21 + -21 + 7x Combine like terms: 21 + -21 = 0 0 + 7x = 21 + -21 + 7x 7x = 21 + -21 + 7x Combine like terms: 21 + -21 = 0 7x = 0 + 7x 7x = 7x Add '-7x' to each side of the equation. 7x + -7x = 7x + -7x Combine like terms: 7x + -7x = 0 0 = 7x + -7x Combine like terms: 7x + -7x = 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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