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Simplifying -7(3 + 8x) = x + -21 (3 * -7 + 8x * -7) = x + -21 (-21 + -56x) = x + -21 Reorder the terms: -21 + -56x = -21 + x Add '21' to each side of the equation. -21 + 21 + -56x = -21 + 21 + x Combine like terms: -21 + 21 = 0 0 + -56x = -21 + 21 + x -56x = -21 + 21 + x Combine like terms: -21 + 21 = 0 -56x = 0 + x -56x = x Solving -56x = x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. -56x + -1x = x + -1x Combine like terms: -56x + -1x = -57x -57x = x + -1x Combine like terms: x + -1x = 0 -57x = 0 Divide each side by '-57'. x = 0 Simplifying x = 0
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