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Simplifying x + 21 + 7x + -3 = 90 Reorder the terms: 21 + -3 + x + 7x = 90 Combine like terms: 21 + -3 = 18 18 + x + 7x = 90 Combine like terms: x + 7x = 8x 18 + 8x = 90 Solving 18 + 8x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + 8x = 90 + -18 Combine like terms: 18 + -18 = 0 0 + 8x = 90 + -18 8x = 90 + -18 Combine like terms: 90 + -18 = 72 8x = 72 Divide each side by '8'. x = 9 Simplifying x = 9
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