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Simplifying 7x + (90 + -1x) = 21 Remove parenthesis around (90 + -1x) 7x + 90 + -1x = 21 Reorder the terms: 90 + 7x + -1x = 21 Combine like terms: 7x + -1x = 6x 90 + 6x = 21 Solving 90 + 6x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-90' to each side of the equation. 90 + -90 + 6x = 21 + -90 Combine like terms: 90 + -90 = 0 0 + 6x = 21 + -90 6x = 21 + -90 Combine like terms: 21 + -90 = -69 6x = -69 Divide each side by '6'. x = -11.5 Simplifying x = -11.5
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