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Simplifying -9 = 3x + 7(x + 3) Reorder the terms: -9 = 3x + 7(3 + x) -9 = 3x + (3 * 7 + x * 7) -9 = 3x + (21 + 7x) Reorder the terms: -9 = 21 + 3x + 7x Combine like terms: 3x + 7x = 10x -9 = 21 + 10x Solving -9 = 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. -9 + -10x = 21 + 10x + -10x Combine like terms: 10x + -10x = 0 -9 + -10x = 21 + 0 -9 + -10x = 21 Add '9' to each side of the equation. -9 + 9 + -10x = 21 + 9 Combine like terms: -9 + 9 = 0 0 + -10x = 21 + 9 -10x = 21 + 9 Combine like terms: 21 + 9 = 30 -10x = 30 Divide each side by '-10'. x = -3 Simplifying x = -3
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