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Simplifying 7(3x + -3) = 20x + -13 Reorder the terms: 7(-3 + 3x) = 20x + -13 (-3 * 7 + 3x * 7) = 20x + -13 (-21 + 21x) = 20x + -13 Reorder the terms: -21 + 21x = -13 + 20x Solving -21 + 21x = -13 + 20x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20x' to each side of the equation. -21 + 21x + -20x = -13 + 20x + -20x Combine like terms: 21x + -20x = 1x -21 + 1x = -13 + 20x + -20x Combine like terms: 20x + -20x = 0 -21 + 1x = -13 + 0 -21 + 1x = -13 Add '21' to each side of the equation. -21 + 21 + 1x = -13 + 21 Combine like terms: -21 + 21 = 0 0 + 1x = -13 + 21 1x = -13 + 21 Combine like terms: -13 + 21 = 8 1x = 8 Divide each side by '1'. x = 8 Simplifying x = 8
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