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Simplifying 7x + -3(3x + 7) = -9 Reorder the terms: 7x + -3(7 + 3x) = -9 7x + (7 * -3 + 3x * -3) = -9 7x + (-21 + -9x) = -9 Reorder the terms: -21 + 7x + -9x = -9 Combine like terms: 7x + -9x = -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 = 12 -2x = 12 Divide each side by '-2'. x = -6 Simplifying x = -6
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