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Simplifying 3x + -1(7x + 7) = 9 Reorder the terms: 3x + -1(7 + 7x) = 9 3x + (7 * -1 + 7x * -1) = 9 3x + (-7 + -7x) = 9 Reorder the terms: -7 + 3x + -7x = 9 Combine like terms: 3x + -7x = -4x -7 + -4x = 9 Solving -7 + -4x = 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 + -4x = 9 + 7 Combine like terms: -7 + 7 = 0 0 + -4x = 9 + 7 -4x = 9 + 7 Combine like terms: 9 + 7 = 16 -4x = 16 Divide each side by '-4'. x = -4 Simplifying x = -4
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