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Simplifying 7x + 4 + 5x + 8 = 90 Reorder the terms: 4 + 8 + 7x + 5x = 90 Combine like terms: 4 + 8 = 12 12 + 7x + 5x = 90 Combine like terms: 7x + 5x = 12x 12 + 12x = 90 Solving 12 + 12x = 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 + 12x = 90 + -12 Combine like terms: 12 + -12 = 0 0 + 12x = 90 + -12 12x = 90 + -12 Combine like terms: 90 + -12 = 78 12x = 78 Divide each side by '12'. x = 6.5 Simplifying x = 6.5
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