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Simplifying 9 + 7(x + -7) = 15 Reorder the terms: 9 + 7(-7 + x) = 15 9 + (-7 * 7 + x * 7) = 15 9 + (-49 + 7x) = 15 Combine like terms: 9 + -49 = -40 -40 + 7x = 15 Solving -40 + 7x = 15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '40' to each side of the equation. -40 + 40 + 7x = 15 + 40 Combine like terms: -40 + 40 = 0 0 + 7x = 15 + 40 7x = 15 + 40 Combine like terms: 15 + 40 = 55 7x = 55 Divide each side by '7'. x = 7.857142857 Simplifying x = 7.857142857
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