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Simplifying 3x + (4x + -15) = 90 Reorder the terms: 3x + (-15 + 4x) = 90 Remove parenthesis around (-15 + 4x) 3x + -15 + 4x = 90 Reorder the terms: -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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