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Simplifying (5x + 54) + (3x + 12) = 90 Reorder the terms: (54 + 5x) + (3x + 12) = 90 Remove parenthesis around (54 + 5x) 54 + 5x + (3x + 12) = 90 Reorder the terms: 54 + 5x + (12 + 3x) = 90 Remove parenthesis around (12 + 3x) 54 + 5x + 12 + 3x = 90 Reorder the terms: 54 + 12 + 5x + 3x = 90 Combine like terms: 54 + 12 = 66 66 + 5x + 3x = 90 Combine like terms: 5x + 3x = 8x 66 + 8x = 90 Solving 66 + 8x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-66' to each side of the equation. 66 + -66 + 8x = 90 + -66 Combine like terms: 66 + -66 = 0 0 + 8x = 90 + -66 8x = 90 + -66 Combine like terms: 90 + -66 = 24 8x = 24 Divide each side by '8'. x = 3 Simplifying x = 3
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