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Simplifying 21 + x = 5(1 + -3x) 21 + x = (1 * 5 + -3x * 5) 21 + x = (5 + -15x) Solving 21 + x = 5 + -15x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15x' to each side of the equation. 21 + x + 15x = 5 + -15x + 15x Combine like terms: x + 15x = 16x 21 + 16x = 5 + -15x + 15x Combine like terms: -15x + 15x = 0 21 + 16x = 5 + 0 21 + 16x = 5 Add '-21' to each side of the equation. 21 + -21 + 16x = 5 + -21 Combine like terms: 21 + -21 = 0 0 + 16x = 5 + -21 16x = 5 + -21 Combine like terms: 5 + -21 = -16 16x = -16 Divide each side by '16'. x = -1 Simplifying x = -1
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