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Simplifying 20 + 1 = -3(3x + -7) Combine like terms: 20 + 1 = 21 21 = -3(3x + -7) Reorder the terms: 21 = -3(-7 + 3x) 21 = (-7 * -3 + 3x * -3) 21 = (21 + -9x) Add '-21' to each side of the equation. 21 + -21 = 21 + -21 + -9x Combine like terms: 21 + -21 = 0 0 = 21 + -21 + -9x Combine like terms: 21 + -21 = 0 0 = 0 + -9x 0 = -9x Solving 0 = -9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9x' to each side of the equation. 0 + 9x = -9x + 9x Remove the zero: 9x = -9x + 9x Combine like terms: -9x + 9x = 0 9x = 0 Divide each side by '9'. x = 0 Simplifying x = 0
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