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Simplifying (3x + 3) + (1 + 4x) = 90 Reorder the terms: (3 + 3x) + (1 + 4x) = 90 Remove parenthesis around (3 + 3x) 3 + 3x + (1 + 4x) = 90 Remove parenthesis around (1 + 4x) 3 + 3x + 1 + 4x = 90 Reorder the terms: 3 + 1 + 3x + 4x = 90 Combine like terms: 3 + 1 = 4 4 + 3x + 4x = 90 Combine like terms: 3x + 4x = 7x 4 + 7x = 90 Solving 4 + 7x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 7x = 90 + -4 Combine like terms: 4 + -4 = 0 0 + 7x = 90 + -4 7x = 90 + -4 Combine like terms: 90 + -4 = 86 7x = 86 Divide each side by '7'. x = 12.28571429 Simplifying x = 12.28571429
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