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Simplifying (9x + -3) + -1(7x + 9) = 0 Reorder the terms: (-3 + 9x) + -1(7x + 9) = 0 Remove parenthesis around (-3 + 9x) -3 + 9x + -1(7x + 9) = 0 Reorder the terms: -3 + 9x + -1(9 + 7x) = 0 -3 + 9x + (9 * -1 + 7x * -1) = 0 -3 + 9x + (-9 + -7x) = 0 Reorder the terms: -3 + -9 + 9x + -7x = 0 Combine like terms: -3 + -9 = -12 -12 + 9x + -7x = 0 Combine like terms: 9x + -7x = 2x -12 + 2x = 0 Solving -12 + 2x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 2x = 0 + 12 Combine like terms: -12 + 12 = 0 0 + 2x = 0 + 12 2x = 0 + 12 Combine like terms: 0 + 12 = 12 2x = 12 Divide each side by '2'. x = 6 Simplifying x = 6
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