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Simplifying -4x + 7x = 4(x + 2) + -1(x + 8) Combine like terms: -4x + 7x = 3x 3x = 4(x + 2) + -1(x + 8) Reorder the terms: 3x = 4(2 + x) + -1(x + 8) 3x = (2 * 4 + x * 4) + -1(x + 8) 3x = (8 + 4x) + -1(x + 8) Reorder the terms: 3x = 8 + 4x + -1(8 + x) 3x = 8 + 4x + (8 * -1 + x * -1) 3x = 8 + 4x + (-8 + -1x) Reorder the terms: 3x = 8 + -8 + 4x + -1x Combine like terms: 8 + -8 = 0 3x = 0 + 4x + -1x 3x = 4x + -1x Combine like terms: 4x + -1x = 3x 3x = 3x Add '-3x' to each side of the equation. 3x + -3x = 3x + -3x Combine like terms: 3x + -3x = 0 0 = 3x + -3x Combine like terms: 3x + -3x = 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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