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Simplifying x + 90 = (2x + 21) Reorder the terms: 90 + x = (2x + 21) Reorder the terms: 90 + x = (21 + 2x) Remove parenthesis around (21 + 2x) 90 + x = 21 + 2x Solving 90 + x = 21 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. 90 + x + -2x = 21 + 2x + -2x Combine like terms: x + -2x = -1x 90 + -1x = 21 + 2x + -2x Combine like terms: 2x + -2x = 0 90 + -1x = 21 + 0 90 + -1x = 21 Add '-90' to each side of the equation. 90 + -90 + -1x = 21 + -90 Combine like terms: 90 + -90 = 0 0 + -1x = 21 + -90 -1x = 21 + -90 Combine like terms: 21 + -90 = -69 -1x = -69 Divide each side by '-1'. x = 69 Simplifying x = 69
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