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Simplifying 2x = 21 + -1(5x + 42) Reorder the terms: 2x = 21 + -1(42 + 5x) 2x = 21 + (42 * -1 + 5x * -1) 2x = 21 + (-42 + -5x) Combine like terms: 21 + -42 = -21 2x = -21 + -5x Solving 2x = -21 + -5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5x' to each side of the equation. 2x + 5x = -21 + -5x + 5x Combine like terms: 2x + 5x = 7x 7x = -21 + -5x + 5x Combine like terms: -5x + 5x = 0 7x = -21 + 0 7x = -21 Divide each side by '7'. x = -3 Simplifying x = -3
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