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Simplifying (4x + -3) + (5x + 12) = 90 Reorder the terms: (-3 + 4x) + (5x + 12) = 90 Remove parenthesis around (-3 + 4x) -3 + 4x + (5x + 12) = 90 Reorder the terms: -3 + 4x + (12 + 5x) = 90 Remove parenthesis around (12 + 5x) -3 + 4x + 12 + 5x = 90 Reorder the terms: -3 + 12 + 4x + 5x = 90 Combine like terms: -3 + 12 = 9 9 + 4x + 5x = 90 Combine like terms: 4x + 5x = 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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