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Simplifying 7(3x + -20) = 20x + -13 Reorder the terms: 7(-20 + 3x) = 20x + -13 (-20 * 7 + 3x * 7) = 20x + -13 (-140 + 21x) = 20x + -13 Reorder the terms: -140 + 21x = -13 + 20x Solving -140 + 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. -140 + 21x + -20x = -13 + 20x + -20x Combine like terms: 21x + -20x = 1x -140 + 1x = -13 + 20x + -20x Combine like terms: 20x + -20x = 0 -140 + 1x = -13 + 0 -140 + 1x = -13 Add '140' to each side of the equation. -140 + 140 + 1x = -13 + 140 Combine like terms: -140 + 140 = 0 0 + 1x = -13 + 140 1x = -13 + 140 Combine like terms: -13 + 140 = 127 1x = 127 Divide each side by '1'. x = 127 Simplifying x = 127
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