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Simplifying 9x + -15 + -7x + -21 = 0 Reorder the terms: -15 + -21 + 9x + -7x = 0 Combine like terms: -15 + -21 = -36 -36 + 9x + -7x = 0 Combine like terms: 9x + -7x = 2x -36 + 2x = 0 Solving -36 + 2x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '36' to each side of the equation. -36 + 36 + 2x = 0 + 36 Combine like terms: -36 + 36 = 0 0 + 2x = 0 + 36 2x = 0 + 36 Combine like terms: 0 + 36 = 36 2x = 36 Divide each side by '2'. x = 18 Simplifying x = 18
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