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Simplifying 9x + 3x + 0 = 3(3x + x) Reorder the terms: 0 + 9x + 3x = 3(3x + x) Remove the zero: 9x + 3x = 3(3x + x) Combine like terms: 9x + 3x = 12x 12x = 3(3x + x) Combine like terms: 3x + x = 4x 12x = 3(4x) Remove parenthesis around (4x) 12x = 3 * 4x Multiply 3 * 4 12x = 12x Add '-12x' to each side of the equation. 12x + -12x = 12x + -12x Combine like terms: 12x + -12x = 0 0 = 12x + -12x Combine like terms: 12x + -12x = 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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