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Simplifying 7(9 + -1x) + x = 84 (9 * 7 + -1x * 7) + x = 84 (63 + -7x) + x = 84 Combine like terms: -7x + x = -6x 63 + -6x = 84 Solving 63 + -6x = 84 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-63' to each side of the equation. 63 + -63 + -6x = 84 + -63 Combine like terms: 63 + -63 = 0 0 + -6x = 84 + -63 -6x = 84 + -63 Combine like terms: 84 + -63 = 21 -6x = 21 Divide each side by '-6'. x = -3.5 Simplifying x = -3.5
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