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Simplifying 7x + (90 + -1x) = 210 Remove parenthesis around (90 + -1x) 7x + 90 + -1x = 210 Reorder the terms: 90 + 7x + -1x = 210 Combine like terms: 7x + -1x = 6x 90 + 6x = 210 Solving 90 + 6x = 210 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 = 210 + -90 Combine like terms: 90 + -90 = 0 0 + 6x = 210 + -90 6x = 210 + -90 Combine like terms: 210 + -90 = 120 6x = 120 Divide each side by '6'. x = 20 Simplifying x = 20
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