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Simplifying (3x + -6) + (4x + -9) = 90 Reorder the terms: (-6 + 3x) + (4x + -9) = 90 Remove parenthesis around (-6 + 3x) -6 + 3x + (4x + -9) = 90 Reorder the terms: -6 + 3x + (-9 + 4x) = 90 Remove parenthesis around (-9 + 4x) -6 + 3x + -9 + 4x = 90 Reorder the terms: -6 + -9 + 3x + 4x = 90 Combine like terms: -6 + -9 = -15 -15 + 3x + 4x = 90 Combine like terms: 3x + 4x = 7x -15 + 7x = 90 Solving -15 + 7x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + 7x = 90 + 15 Combine like terms: -15 + 15 = 0 0 + 7x = 90 + 15 7x = 90 + 15 Combine like terms: 90 + 15 = 105 7x = 105 Divide each side by '7'. x = 15 Simplifying x = 15
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