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Simplifying (9 + -1x) + (7 + -1x) + x = 12 Remove parenthesis around (9 + -1x) 9 + -1x + (7 + -1x) + x = 12 Remove parenthesis around (7 + -1x) 9 + -1x + 7 + -1x + x = 12 Reorder the terms: 9 + 7 + -1x + -1x + x = 12 Combine like terms: 9 + 7 = 16 16 + -1x + -1x + x = 12 Combine like terms: -1x + -1x = -2x 16 + -2x + x = 12 Combine like terms: -2x + x = -1x 16 + -1x = 12 Solving 16 + -1x = 12 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-16' to each side of the equation. 16 + -16 + -1x = 12 + -16 Combine like terms: 16 + -16 = 0 0 + -1x = 12 + -16 -1x = 12 + -16 Combine like terms: 12 + -16 = -4 -1x = -4 Divide each side by '-1'. x = 4 Simplifying x = 4
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