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Simplifying ((7x + -12) + (2x + 21)) = 90 Reorder the terms: ((-12 + 7x) + (2x + 21)) = 90 Remove parenthesis around (-12 + 7x) (-12 + 7x + (2x + 21)) = 90 Reorder the terms: (-12 + 7x + (21 + 2x)) = 90 Remove parenthesis around (21 + 2x) (-12 + 7x + 21 + 2x) = 90 Reorder the terms: (-12 + 21 + 7x + 2x) = 90 Combine like terms: -12 + 21 = 9 (9 + 7x + 2x) = 90 Combine like terms: 7x + 2x = 9x (9 + 9x) = 90 Remove parenthesis around (9 + 9x) 9 + 9x = 90 Solving 9 + 9x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 9x = 90 + -9 Combine like terms: 9 + -9 = 0 0 + 9x = 90 + -9 9x = 90 + -9 Combine like terms: 90 + -9 = 81 9x = 81 Divide each side by '9'. x = 9 Simplifying x = 9
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