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Simplifying -21 = 6(x + -5) + -3x Reorder the terms: -21 = 6(-5 + x) + -3x -21 = (-5 * 6 + x * 6) + -3x -21 = (-30 + 6x) + -3x Combine like terms: 6x + -3x = 3x -21 = -30 + 3x Solving -21 = -30 + 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 = -30 + 3x + -3x Combine like terms: 3x + -3x = 0 -21 + -3x = -30 + 0 -21 + -3x = -30 Add '21' to each side of the equation. -21 + 21 + -3x = -30 + 21 Combine like terms: -21 + 21 = 0 0 + -3x = -30 + 21 -3x = -30 + 21 Combine like terms: -30 + 21 = -9 -3x = -9 Divide each side by '-3'. x = 3 Simplifying x = 3
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