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Simplifying -21 + 2x = -7(3 + 8x) -21 + 2x = (3 * -7 + 8x * -7) -21 + 2x = (-21 + -56x) Add '21' to each side of the equation. -21 + 21 + 2x = -21 + 21 + -56x Combine like terms: -21 + 21 = 0 0 + 2x = -21 + 21 + -56x 2x = -21 + 21 + -56x Combine like terms: -21 + 21 = 0 2x = 0 + -56x 2x = -56x Solving 2x = -56x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '56x' to each side of the equation. 2x + 56x = -56x + 56x Combine like terms: 2x + 56x = 58x 58x = -56x + 56x Combine like terms: -56x + 56x = 0 58x = 0 Divide each side by '58'. x = 0 Simplifying x = 0
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