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Simplifying 21x + -4 + -17x = 2(2x + -4) + 4 Reorder the terms: -4 + 21x + -17x = 2(2x + -4) + 4 Combine like terms: 21x + -17x = 4x -4 + 4x = 2(2x + -4) + 4 Reorder the terms: -4 + 4x = 2(-4 + 2x) + 4 -4 + 4x = (-4 * 2 + 2x * 2) + 4 -4 + 4x = (-8 + 4x) + 4 Reorder the terms: -4 + 4x = -8 + 4 + 4x Combine like terms: -8 + 4 = -4 -4 + 4x = -4 + 4x Add '4' to each side of the equation. -4 + 4 + 4x = -4 + 4 + 4x Combine like terms: -4 + 4 = 0 0 + 4x = -4 + 4 + 4x 4x = -4 + 4 + 4x Combine like terms: -4 + 4 = 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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