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Simplifying (7x + 12) + (9x + -5) = 0 Reorder the terms: (12 + 7x) + (9x + -5) = 0 Remove parenthesis around (12 + 7x) 12 + 7x + (9x + -5) = 0 Reorder the terms: 12 + 7x + (-5 + 9x) = 0 Remove parenthesis around (-5 + 9x) 12 + 7x + -5 + 9x = 0 Reorder the terms: 12 + -5 + 7x + 9x = 0 Combine like terms: 12 + -5 = 7 7 + 7x + 9x = 0 Combine like terms: 7x + 9x = 16x 7 + 16x = 0 Solving 7 + 16x = 0 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 + 16x = 0 + -7 Combine like terms: 7 + -7 = 0 0 + 16x = 0 + -7 16x = 0 + -7 Combine like terms: 0 + -7 = -7 16x = -7 Divide each side by '16'. x = -0.4375 Simplifying x = -0.4375
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