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Simplifying x + (3x + -20) = 90 Reorder the terms: x + (-20 + 3x) = 90 Remove parenthesis around (-20 + 3x) x + -20 + 3x = 90 Reorder the terms: -20 + x + 3x = 90 Combine like terms: x + 3x = 4x -20 + 4x = 90 Solving -20 + 4x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + 4x = 90 + 20 Combine like terms: -20 + 20 = 0 0 + 4x = 90 + 20 4x = 90 + 20 Combine like terms: 90 + 20 = 110 4x = 110 Divide each side by '4'. x = 27.5 Simplifying x = 27.5
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