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Simplifying -7x + 15 + 3x = -9(x + 10) Reorder the terms: 15 + -7x + 3x = -9(x + 10) Combine like terms: -7x + 3x = -4x 15 + -4x = -9(x + 10) Reorder the terms: 15 + -4x = -9(10 + x) 15 + -4x = (10 * -9 + x * -9) 15 + -4x = (-90 + -9x) Solving 15 + -4x = -90 + -9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9x' to each side of the equation. 15 + -4x + 9x = -90 + -9x + 9x Combine like terms: -4x + 9x = 5x 15 + 5x = -90 + -9x + 9x Combine like terms: -9x + 9x = 0 15 + 5x = -90 + 0 15 + 5x = -90 Add '-15' to each side of the equation. 15 + -15 + 5x = -90 + -15 Combine like terms: 15 + -15 = 0 0 + 5x = -90 + -15 5x = -90 + -15 Combine like terms: -90 + -15 = -105 5x = -105 Divide each side by '5'. x = -21 Simplifying x = -21
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