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Simplifying 21 = -6x + 3(x + -4) Reorder the terms: 21 = -6x + 3(-4 + x) 21 = -6x + (-4 * 3 + x * 3) 21 = -6x + (-12 + 3x) Reorder the terms: 21 = -12 + -6x + 3x Combine like terms: -6x + 3x = -3x 21 = -12 + -3x Solving 21 = -12 + -3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3x' to each side of the equation. 21 + 3x = -12 + -3x + 3x Combine like terms: -3x + 3x = 0 21 + 3x = -12 + 0 21 + 3x = -12 Add '-21' to each side of the equation. 21 + -21 + 3x = -12 + -21 Combine like terms: 21 + -21 = 0 0 + 3x = -12 + -21 3x = -12 + -21 Combine like terms: -12 + -21 = -33 3x = -33 Divide each side by '3'. x = -11 Simplifying x = -11
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