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Simplifying 21 + -3x = -3(1 + 3x) 21 + -3x = (1 * -3 + 3x * -3) 21 + -3x = (-3 + -9x) Solving 21 + -3x = -3 + -9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9x' to each side of the equation. 21 + -3x + 9x = -3 + -9x + 9x Combine like terms: -3x + 9x = 6x 21 + 6x = -3 + -9x + 9x Combine like terms: -9x + 9x = 0 21 + 6x = -3 + 0 21 + 6x = -3 Add '-21' to each side of the equation. 21 + -21 + 6x = -3 + -21 Combine like terms: 21 + -21 = 0 0 + 6x = -3 + -21 6x = -3 + -21 Combine like terms: -3 + -21 = -24 6x = -24 Divide each side by '6'. x = -4 Simplifying x = -4
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