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