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Simplifying -13x + -7x = 10x + 21 Combine like terms: -13x + -7x = -20x -20x = 10x + 21 Reorder the terms: -20x = 21 + 10x Solving -20x = 21 + 10x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10x' to each side of the equation. -20x + -10x = 21 + 10x + -10x Combine like terms: -20x + -10x = -30x -30x = 21 + 10x + -10x Combine like terms: 10x + -10x = 0 -30x = 21 + 0 -30x = 21 Divide each side by '-30'. x = -0.7 Simplifying x = -0.7
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