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Simplifying -7x + -15 = 5x + 21 Reorder the terms: -15 + -7x = 5x + 21 Reorder the terms: -15 + -7x = 21 + 5x Solving -15 + -7x = 21 + 5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5x' to each side of the equation. -15 + -7x + -5x = 21 + 5x + -5x Combine like terms: -7x + -5x = -12x -15 + -12x = 21 + 5x + -5x Combine like terms: 5x + -5x = 0 -15 + -12x = 21 + 0 -15 + -12x = 21 Add '15' to each side of the equation. -15 + 15 + -12x = 21 + 15 Combine like terms: -15 + 15 = 0 0 + -12x = 21 + 15 -12x = 21 + 15 Combine like terms: 21 + 15 = 36 -12x = 36 Divide each side by '-12'. x = -3 Simplifying x = -3
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