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Simplifying 5x + -7(x + 3) = 9 Reorder the terms: 5x + -7(3 + x) = 9 5x + (3 * -7 + x * -7) = 9 5x + (-21 + -7x) = 9 Reorder the terms: -21 + 5x + -7x = 9 Combine like terms: 5x + -7x = -2x -21 + -2x = 9 Solving -21 + -2x = 9 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + -2x = 9 + 21 Combine like terms: -21 + 21 = 0 0 + -2x = 9 + 21 -2x = 9 + 21 Combine like terms: 9 + 21 = 30 -2x = 30 Divide each side by '-2'. x = -15 Simplifying x = -15
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