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Simplifying 3x + -1(2x + 7) = -9 Reorder the terms: 3x + -1(7 + 2x) = -9 3x + (7 * -1 + 2x * -1) = -9 3x + (-7 + -2x) = -9 Reorder the terms: -7 + 3x + -2x = -9 Combine like terms: 3x + -2x = 1x -7 + 1x = -9 Solving -7 + 1x = -9 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 1x = -9 + 7 Combine like terms: -7 + 7 = 0 0 + 1x = -9 + 7 1x = -9 + 7 Combine like terms: -9 + 7 = -2 1x = -2 Divide each side by '1'. x = -2 Simplifying x = -2
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