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Simplifying 3(12 + -4x) = 21 + -13x (12 * 3 + -4x * 3) = 21 + -13x (36 + -12x) = 21 + -13x Solving 36 + -12x = 21 + -13x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '13x' to each side of the equation. 36 + -12x + 13x = 21 + -13x + 13x Combine like terms: -12x + 13x = 1x 36 + 1x = 21 + -13x + 13x Combine like terms: -13x + 13x = 0 36 + 1x = 21 + 0 36 + 1x = 21 Add '-36' to each side of the equation. 36 + -36 + 1x = 21 + -36 Combine like terms: 36 + -36 = 0 0 + 1x = 21 + -36 1x = 21 + -36 Combine like terms: 21 + -36 = -15 1x = -15 Divide each side by '1'. x = -15 Simplifying x = -15
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