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Simplifying 5(x + -21) = 20x Reorder the terms: 5(-21 + x) = 20x (-21 * 5 + x * 5) = 20x (-105 + 5x) = 20x Solving -105 + 5x = 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. -105 + 5x + -20x = 20x + -20x Combine like terms: 5x + -20x = -15x -105 + -15x = 20x + -20x Combine like terms: 20x + -20x = 0 -105 + -15x = 0 Add '105' to each side of the equation. -105 + 105 + -15x = 0 + 105 Combine like terms: -105 + 105 = 0 0 + -15x = 0 + 105 -15x = 0 + 105 Combine like terms: 0 + 105 = 105 -15x = 105 Divide each side by '-15'. x = -7 Simplifying x = -7
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