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Simplifying (3x + -5) + (5x + -9) = 90 Reorder the terms: (-5 + 3x) + (5x + -9) = 90 Remove parenthesis around (-5 + 3x) -5 + 3x + (5x + -9) = 90 Reorder the terms: -5 + 3x + (-9 + 5x) = 90 Remove parenthesis around (-9 + 5x) -5 + 3x + -9 + 5x = 90 Reorder the terms: -5 + -9 + 3x + 5x = 90 Combine like terms: -5 + -9 = -14 -14 + 3x + 5x = 90 Combine like terms: 3x + 5x = 8x -14 + 8x = 90 Solving -14 + 8x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + 8x = 90 + 14 Combine like terms: -14 + 14 = 0 0 + 8x = 90 + 14 8x = 90 + 14 Combine like terms: 90 + 14 = 104 8x = 104 Divide each side by '8'. x = 13 Simplifying x = 13
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