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Simplifying 3x + 2(2x + -7) = 6 + -20 + 7x Reorder the terms: 3x + 2(-7 + 2x) = 6 + -20 + 7x 3x + (-7 * 2 + 2x * 2) = 6 + -20 + 7x 3x + (-14 + 4x) = 6 + -20 + 7x Reorder the terms: -14 + 3x + 4x = 6 + -20 + 7x Combine like terms: 3x + 4x = 7x -14 + 7x = 6 + -20 + 7x Combine like terms: 6 + -20 = -14 -14 + 7x = -14 + 7x Add '14' to each side of the equation. -14 + 14 + 7x = -14 + 14 + 7x Combine like terms: -14 + 14 = 0 0 + 7x = -14 + 14 + 7x 7x = -14 + 14 + 7x Combine like terms: -14 + 14 = 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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