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