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Simplifying (4x + 5) + (2x + 7) = 90 Reorder the terms: (5 + 4x) + (2x + 7) = 90 Remove parenthesis around (5 + 4x) 5 + 4x + (2x + 7) = 90 Reorder the terms: 5 + 4x + (7 + 2x) = 90 Remove parenthesis around (7 + 2x) 5 + 4x + 7 + 2x = 90 Reorder the terms: 5 + 7 + 4x + 2x = 90 Combine like terms: 5 + 7 = 12 12 + 4x + 2x = 90 Combine like terms: 4x + 2x = 6x 12 + 6x = 90 Solving 12 + 6x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 6x = 90 + -12 Combine like terms: 12 + -12 = 0 0 + 6x = 90 + -12 6x = 90 + -12 Combine like terms: 90 + -12 = 78 6x = 78 Divide each side by '6'. x = 13 Simplifying x = 13
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