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Simplifying (2x + -3) + (7x + 21) = 90 Reorder the terms: (-3 + 2x) + (7x + 21) = 90 Remove parenthesis around (-3 + 2x) -3 + 2x + (7x + 21) = 90 Reorder the terms: -3 + 2x + (21 + 7x) = 90 Remove parenthesis around (21 + 7x) -3 + 2x + 21 + 7x = 90 Reorder the terms: -3 + 21 + 2x + 7x = 90 Combine like terms: -3 + 21 = 18 18 + 2x + 7x = 90 Combine like terms: 2x + 7x = 9x 18 + 9x = 90 Solving 18 + 9x = 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 + 9x = 90 + -18 Combine like terms: 18 + -18 = 0 0 + 9x = 90 + -18 9x = 90 + -18 Combine like terms: 90 + -18 = 72 9x = 72 Divide each side by '9'. x = 8 Simplifying x = 8
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