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Simplifying x + (3x + 12) = 90 Reorder the terms: x + (12 + 3x) = 90 Remove parenthesis around (12 + 3x) x + 12 + 3x = 90 Reorder the terms: 12 + x + 3x = 90 Combine like terms: x + 3x = 4x 12 + 4x = 90 Solving 12 + 4x = 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 + 4x = 90 + -12 Combine like terms: 12 + -12 = 0 0 + 4x = 90 + -12 4x = 90 + -12 Combine like terms: 90 + -12 = 78 4x = 78 Divide each side by '4'. x = 19.5 Simplifying x = 19.5
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