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Simplifying 5(x + 3) + -7x = 9 Reorder the terms: 5(3 + x) + -7x = 9 (3 * 5 + x * 5) + -7x = 9 (15 + 5x) + -7x = 9 Combine like terms: 5x + -7x = -2x 15 + -2x = 9 Solving 15 + -2x = 9 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + -2x = 9 + -15 Combine like terms: 15 + -15 = 0 0 + -2x = 9 + -15 -2x = 9 + -15 Combine like terms: 9 + -15 = -6 -2x = -6 Divide each side by '-2'. x = 3 Simplifying x = 3
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