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Simplifying -7x + -21 = 15 + -10x Reorder the terms: -21 + -7x = 15 + -10x Solving -21 + -7x = 15 + -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. -21 + -7x + 10x = 15 + -10x + 10x Combine like terms: -7x + 10x = 3x -21 + 3x = 15 + -10x + 10x Combine like terms: -10x + 10x = 0 -21 + 3x = 15 + 0 -21 + 3x = 15 Add '21' to each side of the equation. -21 + 21 + 3x = 15 + 21 Combine like terms: -21 + 21 = 0 0 + 3x = 15 + 21 3x = 15 + 21 Combine like terms: 15 + 21 = 36 3x = 36 Divide each side by '3'. x = 12 Simplifying x = 12
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