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Simplifying 3(3x + -9) + 7 = 9x + -20 Reorder the terms: 3(-9 + 3x) + 7 = 9x + -20 (-9 * 3 + 3x * 3) + 7 = 9x + -20 (-27 + 9x) + 7 = 9x + -20 Reorder the terms: -27 + 7 + 9x = 9x + -20 Combine like terms: -27 + 7 = -20 -20 + 9x = 9x + -20 Reorder the terms: -20 + 9x = -20 + 9x Add '20' to each side of the equation. -20 + 20 + 9x = -20 + 20 + 9x Combine like terms: -20 + 20 = 0 0 + 9x = -20 + 20 + 9x 9x = -20 + 20 + 9x Combine like terms: -20 + 20 = 0 9x = 0 + 9x 9x = 9x Add '-9x' to each side of the equation. 9x + -9x = 9x + -9x Combine like terms: 9x + -9x = 0 0 = 9x + -9x Combine like terms: 9x + -9x = 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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