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Simplifying (19x + -30) + (x) = 90 Reorder the terms: (-30 + 19x) + (x) = 90 Remove parenthesis around (-30 + 19x) -30 + 19x + (x) = 90 -30 + 19x + x = 90 Combine like terms: 19x + x = 20x -30 + 20x = 90 Solving -30 + 20x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 30 + 20x = 90 + 30 Combine like terms: -30 + 30 = 0 0 + 20x = 90 + 30 20x = 90 + 30 Combine like terms: 90 + 30 = 120 20x = 120 Divide each side by '20'. x = 6 Simplifying x = 6
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